feat: fixing the performance issues

package-lock.json

@@ -9,13 +9,12 @@
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-        "@img/sharp-libvips-linux-s390x": "1.2.0",
-        "@img/sharp-libvips-linux-x64": "1.2.0",
-        "@img/sharp-libvips-linuxmusl-arm64": "1.2.0",
-        "@img/sharp-libvips-linuxmusl-x64": "1.2.0",
-        "@img/sharp-linux-arm": "0.34.3",
-        "@img/sharp-linux-arm64": "0.34.3",
-        "@img/sharp-linux-ppc64": "0.34.3",
-        "@img/sharp-linux-s390x": "0.34.3",
-        "@img/sharp-linux-x64": "0.34.3",
-        "@img/sharp-linuxmusl-arm64": "0.34.3",
-        "@img/sharp-linuxmusl-x64": "0.34.3",
-        "@img/sharp-wasm32": "0.34.3",
-        "@img/sharp-win32-arm64": "0.34.3",
-        "@img/sharp-win32-ia32": "0.34.3",
-        "@img/sharp-win32-x64": "0.34.3"
-      }
-    },
     "node_modules/shebang-command": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/shebang-command/-/shebang-command-2.0.0.tgz",
@@ -3193,21 +2701,6 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
-    "node_modules/simple-swizzle": {
-      "version": "0.2.2",
-      "resolved": "https://registry.npmjs.org/simple-swizzle/-/simple-swizzle-0.2.2.tgz",
-      "integrity": "sha512-JA//kQgZtbuY83m+xT+tXJkmJncGMTFT+C+g2h2R9uxkYIrE2yy9sgmcLhCnw57/WSD+Eh3J97FPEDFnbXnDUg==",
-      "license": "MIT",
-      "dependencies": {
-        "is-arrayish": "^0.3.1"
-      }
-    },
-    "node_modules/simple-swizzle/node_modules/is-arrayish": {
-      "version": "0.3.2",
-      "resolved": "https://registry.npmjs.org/is-arrayish/-/is-arrayish-0.3.2.tgz",
-      "integrity": "sha512-eVRqCvVlZbuw3GrM63ovNSNAeA1K16kaR/LRY/92w0zxQ5/1YzwblUX652i4Xs9RwAGjW9d9y6X88t8OaAJfWQ==",
-      "license": "MIT"
-    },
     "node_modules/simple-update-notifier": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/simple-update-notifier/-/simple-update-notifier-2.0.0.tgz",
@@ -3282,6 +2775,18 @@
         "node": "*"
       }
     },
+    "node_modules/sprintf-kit": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/sprintf-kit/-/sprintf-kit-2.0.2.tgz",
+      "integrity": "sha512-lnapdj6W4LflHZGKvl9eVkz5YF0xaTrqpRWVA4cNVOTedwqifIP8ooGImldzT/4IAN5KXFQAyXTdLidYVQdyag==",
+      "license": "ISC",
+      "dependencies": {
+        "es5-ext": "^0.10.64"
+      },
+      "engines": {
+        "node": ">=0.12"
+      }
+    },
     "node_modules/statuses": {
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/statuses/-/statuses-2.0.2.tgz",
@@ -3404,12 +2909,6 @@
       "dev": true,
       "license": "MIT"
     },
-    "node_modules/tiny-inflate": {
-      "version": "1.0.3",
-      "resolved": "https://registry.npmjs.org/tiny-inflate/-/tiny-inflate-1.0.3.tgz",
-      "integrity": "sha512-pkY1fj1cKHb2seWDy0B16HeWyczlJA9/WW3u3c4z/NiWDsO3DOU5D7nhTLE9CF0yXv/QZFY7sEJmj24dK+Rrqw==",
-      "license": "MIT"
-    },
     "node_modules/to-regex-range": {
       "version": "5.0.1",
       "resolved": "https://registry.npmjs.org/to-regex-range/-/to-regex-range-5.0.1.tgz",
@@ -3470,6 +2969,12 @@
       "integrity": "sha512-oJFu94HQb+KVduSUQL7wnpmqnfmLsOA/nAh6b6EH0wCEoK0/mPeXU6c3wKDV83MkOuHPRHtSXKKU99IBazS/2w==",
       "license": "0BSD"
     },
+    "node_modules/type": {
+      "version": "2.7.3",
+      "resolved": "https://registry.npmjs.org/type/-/type-2.7.3.tgz",
+      "integrity": "sha512-8j+1QmAbPvLZow5Qpi6NCaN8FB60p/6x8/vfNqOk/hC+HuvFZhL4+WfekuhQLiqFZXOgQdrs3B+XxEmCc6b3FQ==",
+      "license": "ISC"
+    },
     "node_modules/type-is": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/type-is/-/type-is-2.0.1.tgz",
@@ -3518,24 +3023,13 @@
       "license": "MIT",
       "optional": true
     },
-    "node_modules/unicode-properties": {
-      "version": "1.4.1",
-      "resolved": "https://registry.npmjs.org/unicode-properties/-/unicode-properties-1.4.1.tgz",
-      "integrity": "sha512-CLjCCLQ6UuMxWnbIylkisbRj31qxHPAurvena/0iwSVbQ2G1VY5/HjV0IRabOEbDHlzZlRdCrD4NhB0JtU40Pg==",
-      "license": "MIT",
-      "dependencies": {
-        "base64-js": "^1.3.0",
-        "unicode-trie": "^2.0.0"
-      }
-    },
-    "node_modules/unicode-trie": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/unicode-trie/-/unicode-trie-2.0.0.tgz",
-      "integrity": "sha512-x7bc76x0bm4prf1VLg79uhAzKw8DVboClSN5VxJuQ+LKDOVEW9CdH+VY7SP+vX7xCYQqzzgQpFqz15zeLvAtZQ==",
-      "license": "MIT",
+    "node_modules/uni-global": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/uni-global/-/uni-global-1.0.0.tgz",
+      "integrity": "sha512-WWM3HP+siTxzIWPNUg7hZ4XO8clKi6NoCAJJWnuRL+BAqyFXF8gC03WNyTefGoUXYc47uYgXxpKLIEvo65PEHw==",
+      "license": "ISC",
       "dependencies": {
-        "pako": "^0.2.5",
-        "tiny-inflate": "^1.0.0"
+        "type": "^2.5.0"
       }
     },
     "node_modules/universalify": {

package.json

@@ -5,13 +5,12 @@
   "type": "commonjs",
   "dependencies": {
     "axios": "^1.11.0",
+    "cluster": "^0.7.7",
     "cors": "^2.8.5",
     "express": "^5.1.0",
-    "pdfkit": "^0.17.1",
     "puppeteer": "^24.16.2",
     "puppeteer-extra": "^3.3.6",
-    "puppeteer-extra-plugin-stealth": "^2.11.2",
-    "sharp": "^0.34.3"
+    "puppeteer-extra-plugin-stealth": "^2.11.2"
   },
   "devDependencies": {
     "nodemon": "^3.1.10",

server copy.js

@@ -244,7 +244,6 @@ const applyPrintStyles = async (page, progressTracker) => {
                     background: white !important;
                     color: black !important;
                 }
-
                 /* Remove all unwanted elements like headers, footers, sidebars, etc. */
                 header, footer, nav, aside, .no-print, .ads, .sidebar, .premium-banner,
                 [class*="Header"], [class*="Footer"], [class*="Sidebar"], [id*="Header"],
@@ -255,14 +254,12 @@ const applyPrintStyles = async (page, progressTracker) => {
                 .Layout_sidebar-wrapper__unavM, .Layout_is-open__9DQr4 {
                     display: none !important;
                 }
-
                 /* Force all elements to have a transparent background and no shadow */
                 * {
                     box-shadow: none !important;
                     background: transparent !important;
                     color: inherit !important;
                 }
-
                 /*
                  * KEY FIX: Target the main document container.
                  * Force it to be a block element, remove any transforms or max-widths,
@@ -279,7 +276,6 @@ const applyPrintStyles = async (page, progressTracker) => {
                     box-sizing: border-box; /* Include padding in width calculation */
                     transform: none !important;
                 }
-
                 /* Ensure individual pages and images within the document use the full width */
                 [data-page], .page, .document-page, img {
                     page-break-after: always !important;
@@ -306,7 +302,7 @@ const studocuDownloader = async (url, options = {}, progressTracker = null) => {
         progressTracker?.updateProgress(0, 'initializing', 'Starting browser...');
 
         console.log("🚀 Launching browser with enhanced stealth configuration...");
-        browser = await puppeteerExtra.launch({
+        browser = await puppeteerExtra.launch({ // UPDATED: Use puppeteerExtra
             headless: true,
             args: [
                 '--no-sandbox',
@@ -330,29 +326,26 @@ const studocuDownloader = async (url, options = {}, progressTracker = null) => {
             ],
             ignoreHTTPSErrors: true,
             timeout: 300000,
-            // --- FIX: Increased protocolTimeout for long-running operations ---
-            protocolTimeout: 600000 // 10 minutes, increased from the default 30 seconds
         });
 
         const page = await browser.newPage();
 
-        // --- FIX: Increase default navigation and action timeouts ---
-        page.setDefaultNavigationTimeout(180000); // 3 minutes for navigation
-        page.setDefaultTimeout(180000); // 3 minutes for other actions (e.g., waitForSelector)
-
         progressTracker?.updateProgress(2, 'initializing', 'Configuring browser settings...');
 
         await page.setUserAgent('Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/127.0.0.0 Safari/537.36');
         await page.setViewport({ width: 794, height: 1122 }); // A4 size in pixels at 96 DPI
 
+        // NOTE: Stealth plugin handles most of this, but keeping for extra safety
         await page.evaluateOnNewDocument(() => {
             Object.defineProperty(navigator, 'webdriver', { get: () => undefined });
             Object.defineProperty(navigator, 'languages', { get: () => ['en-US', 'en'] });
             Object.defineProperty(navigator, 'plugins', { get: () => [1, 2, 3, 4, 5] });
         });
 
+        // Set up cookie and content bypass
         await bypassCookiesAndRestrictions(page, progressTracker);
 
+        // Block unnecessary resources (UPDATED: Always continue for 'document' to prevent navigation failures)
         await page.setRequestInterception(true);
         page.on('request', (req) => {
             const resourceType = req.resourceType();
@@ -374,7 +367,7 @@ const studocuDownloader = async (url, options = {}, progressTracker = null) => {
                 reqUrl.includes('mixpanel') ||
                 reqUrl.includes('onetrust') ||
                 reqUrl.includes('cookielaw') ||
-                (resourceType === 'other' && reqUrl.includes('/track/'))
+                (resourceType === 'other' && reqUrl.includes('/track/')) // UPDATED: More specific to avoid over-blocking
             ) {
                 req.abort();
             } else {
@@ -382,18 +375,19 @@ const studocuDownloader = async (url, options = {}, progressTracker = null) => {
             }
         });
 
+        // Login if credentials provided
         if (options.email && options.password) {
             progressTracker?.updateProgress(12, 'authenticating', 'Logging into StuDocu...');
 
             console.log("🔑 Logging in to StuDocu...");
-            await page.goto('https://www.studocu.com/en-us/login', { waitUntil: 'domcontentloaded' });
-            await page.waitForSelector('#email');
+            await page.goto('https://www.studocu.com/en-us/login', { waitUntil: 'domcontentloaded', timeout: 120000 });
+            await page.waitForSelector('#email', { timeout: 15000 });
             await page.type('#email', options.email);
             await page.type('#password', options.password);
             await page.click('button[type="submit"]');
             try {
-                await page.waitForNavigation({ waitUntil: 'networkidle2' });
-                await page.waitForSelector('.user-profile, [data-testid="user-menu"]');
+                await page.waitForNavigation({ waitUntil: 'networkidle2', timeout: 30000 });
+                await page.waitForSelector('.user-profile, [data-testid="user-menu"]', { timeout: 10000 });
                 console.log("✅ Login successful.");
                 progressTracker?.updateProgress(18, 'authenticated', 'Login successful');
             } catch (e) {
@@ -404,8 +398,8 @@ const studocuDownloader = async (url, options = {}, progressTracker = null) => {
 
         progressTracker?.updateProgress(25, 'navigating', 'Navigating to homepage first for session setup...');
         console.log(`📄 Navigating to homepage to simulate natural session...`);
-        await page.goto('https://www.studocu.com/en-us', { waitUntil: 'domcontentloaded' });
-        await new Promise(resolve => setTimeout(resolve, 3000));
+        await page.goto('https://www.studocu.com/en-us', { waitUntil: 'domcontentloaded', timeout: 150000 }); // NEW: Preliminary homepage visit
+        await new Promise(resolve => setTimeout(resolve, 3000)); // Short delay for session stabilization
 
         progressTracker?.updateProgress(30, 'navigating', 'Navigating to document...');
         console.log(`📄 Navigating to ${url}...`);
@@ -418,20 +412,22 @@ const studocuDownloader = async (url, options = {}, progressTracker = null) => {
                 attempts++;
                 progressTracker?.updateProgress(30 + (attempts * 5), 'navigating', `Navigation attempt ${attempts}/${maxAttempts}`);
                 console.log(`Navigation attempt ${attempts}/${maxAttempts}`);
-                await page.goto(url, { waitUntil: 'domcontentloaded' });
+                await page.goto(url, { waitUntil: 'domcontentloaded', timeout: 150000 }); // UPDATED: Increased timeout to 2.5 min
                 navigationSuccess = true;
             } catch (e) {
                 console.log(`Navigation attempt ${attempts} failed:`, e.message);
                 if (attempts >= maxAttempts) throw e;
-                await new Promise(resolve => setTimeout(resolve, 15000));
+                await new Promise(resolve => setTimeout(resolve, 15000)); // UPDATED: Increased retry delay to 15s
             }
         }
 
         progressTracker?.updateProgress(40, 'loading', 'Page loaded, waiting for content...');
         await new Promise(resolve => setTimeout(resolve, 5000));
 
+        // Apply content unblurring
         await unblurContent(page, progressTracker);
 
+        // Wait for document content
         progressTracker?.updateProgress(45, 'loading', 'Waiting for document content...');
         console.log("⏳ Waiting for document content to load...");
 
@@ -442,7 +438,7 @@ const studocuDownloader = async (url, options = {}, progressTracker = null) => {
         let contentFound = false;
         for (const selector of contentSelectors) {
             try {
-                await page.waitForSelector(selector);
+                await page.waitForSelector(selector, { timeout: 20000 });
                 console.log(`✅ Found content with selector: ${selector}`);
                 contentFound = true;
                 break;
@@ -455,6 +451,7 @@ const studocuDownloader = async (url, options = {}, progressTracker = null) => {
             console.log("⚠️ No specific content selector found, proceeding with page content...");
         }
 
+        // Enhanced scrolling to load all content
         progressTracker?.updateProgress(50, 'scrolling', 'Loading all document pages...');
         console.log("📜 Loading all document pages with enhanced slow scroll...");
 
@@ -480,8 +477,10 @@ const studocuDownloader = async (url, options = {}, progressTracker = null) => {
 
         progressTracker?.updateProgress(70, 'processing', 'Processing loaded content...');
 
+        // Re-apply unblur after loading new content
         await unblurContent(page, progressTracker);
 
+        // Wait for all images to load
         progressTracker?.updateProgress(75, 'loading_images', 'Loading images...');
         console.log("🖼️ Waiting for all images to load...");
 
@@ -500,6 +499,7 @@ const studocuDownloader = async (url, options = {}, progressTracker = null) => {
         await new Promise(resolve => setTimeout(resolve, 5000));
         progressTracker?.updateProgress(80, 'finalizing', 'Preparing document for PDF generation...');
 
+        // Set exact height
         await page.evaluate(() => {
             const getDocumentHeight = () => Math.max(
                 document.body.scrollHeight, document.body.offsetHeight,
@@ -511,6 +511,7 @@ const studocuDownloader = async (url, options = {}, progressTracker = null) => {
             document.body.style.overflow = 'hidden !important';
         });
 
+        // Content verification
         const contentCheck = await page.evaluate(() => {
             const textContent = document.body.textContent || '';
             const images = document.querySelectorAll('img');
@@ -537,6 +538,7 @@ const studocuDownloader = async (url, options = {}, progressTracker = null) => {
             console.warn("⚠️ Warning: Limited document content detected.");
         }
 
+        // Apply print styles and generate PDF
         await applyPrintStyles(page, progressTracker);
         await page.emulateMediaType('print');
 
@@ -545,10 +547,9 @@ const studocuDownloader = async (url, options = {}, progressTracker = null) => {
 
         const pdfBuffer = await page.pdf({
             printBackground: true,
-            preferCSSPageSize: true,
+            preferCSSPageSize: true, // Use the @page size
             displayHeaderFooter: false,
-            // --- FIX: Increased PDF generation timeout ---
-            timeout: 600000, // 10 minutes, increased from the default 30 seconds
+            timeout: 180000,
             scale: 1,
             omitBackground: false
         });
@@ -588,16 +589,20 @@ app.post('/api/request-download', (req, res) => {
 
     console.log(`🎯 Processing request for: ${url} [Session: ${sessionId}]`);
 
+    // Respond to the client immediately with the session ID
     res.json({ sessionId });
 
+    // --- Start the PDF generation in the background ---
     studocuDownloader(url, { email, password }, progressTracker)
         .then(pdfBuffer => {
+            // Store the successful result
             downloadJobs.set(sessionId, { status: 'completed', buffer: pdfBuffer });
-            progressTrackers.delete(sessionId);
+            progressTrackers.delete(sessionId); // Clean up live tracker
         })
         .catch(error => {
+            // Store the error
             downloadJobs.set(sessionId, { status: 'error', message: error.message });
-            progressTrackers.delete(sessionId);
+            progressTrackers.delete(sessionId); // Clean up live tracker
         });
 });
 
@@ -606,6 +611,7 @@ app.get('/api/progress/:sessionId', (req, res) => {
     const tracker = progressTrackers.get(sessionId);
 
     if (tracker) {
+        // Job is in progress, return live data
         return res.json({
             sessionId,
             progress: tracker.progress,
@@ -617,6 +623,7 @@ app.get('/api/progress/:sessionId', (req, res) => {
 
     const job = downloadJobs.get(sessionId);
     if (job) {
+        // Job is finished, return final state
         if (job.status === 'completed') {
             return res.json({ sessionId, progress: 100, status: 'completed', message: 'PDF generated successfully!' });
         }
@@ -648,6 +655,8 @@ app.get('/api/download/:sessionId', (req, res) => {
         res.setHeader('Content-Type', 'application/pdf');
         res.setHeader('Content-Disposition', 'attachment; filename=studocu-document.pdf');
         res.send(job.buffer);
+        // Optional: Clean up the job after download to save memory
+        // downloadJobs.delete(sessionId);
     } else {
         res.status(500).json({ error: 'An unknown error occurred.' });
     }

server.js

@@ -213,8 +213,8 @@ const unblurContent = async (page, progressTracker) => {
         };
 
         removeRestrictions();
-        const intervalId = setInterval(removeRestrictions, 2000);
-        setTimeout(() => clearInterval(intervalId), 60000);
+        const intervalId = setInterval(removeRestrictions, 1000); // Reduced from 2000ms to 1000ms
+        setTimeout(() => clearInterval(intervalId), 30000); // Reduced from 60000ms to 30000ms
     });
 
     progressTracker?.updateProgress(20, 'unblurring', 'Content restrictions removed');
@@ -244,7 +244,6 @@ const applyPrintStyles = async (page, progressTracker) => {
                     background: white !important;
                     color: black !important;
                 }
-
                 /* Remove all unwanted elements like headers, footers, sidebars, etc. */
                 header, footer, nav, aside, .no-print, .ads, .sidebar, .premium-banner,
                 [class*="Header"], [class*="Footer"], [class*="Sidebar"], [id*="Header"],
@@ -255,14 +254,12 @@ const applyPrintStyles = async (page, progressTracker) => {
                 .Layout_sidebar-wrapper__unavM, .Layout_is-open__9DQr4 {
                     display: none !important;
                 }
-
                 /* Force all elements to have a transparent background and no shadow */
                 * {
                     box-shadow: none !important;
                     background: transparent !important;
                     color: inherit !important;
                 }
-
                 /*
                  * KEY FIX: Target the main document container.
                  * Force it to be a block element, remove any transforms or max-widths,
@@ -279,7 +276,6 @@ const applyPrintStyles = async (page, progressTracker) => {
                     box-sizing: border-box; /* Include padding in width calculation */
                     transform: none !important;
                 }
-
                 /* Ensure individual pages and images within the document use the full width */
                 [data-page], .page, .document-page, img {
                     page-break-after: always !important;
@@ -306,7 +302,7 @@ const studocuDownloader = async (url, options = {}, progressTracker = null) => {
         progressTracker?.updateProgress(0, 'initializing', 'Starting browser...');
 
         console.log("🚀 Launching browser with enhanced stealth configuration...");
-        browser = await puppeteerExtra.launch({
+        browser = await puppeteerExtra.launch({ // UPDATED: Use puppeteerExtra
             headless: true,
             args: [
                 '--no-sandbox',
@@ -330,29 +326,26 @@ const studocuDownloader = async (url, options = {}, progressTracker = null) => {
             ],
             ignoreHTTPSErrors: true,
             timeout: 300000,
-            // --- FIX: Increased protocolTimeout for long-running operations ---
-            protocolTimeout: 600000 // 10 minutes, increased from the default 30 seconds
         });
 
         const page = await browser.newPage();
 
-        // --- FIX: Increase default navigation and action timeouts ---
-        page.setDefaultNavigationTimeout(180000); // 3 minutes for navigation
-        page.setDefaultTimeout(180000); // 3 minutes for other actions (e.g., waitForSelector)
-
         progressTracker?.updateProgress(2, 'initializing', 'Configuring browser settings...');
 
         await page.setUserAgent('Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/127.0.0.0 Safari/537.36');
         await page.setViewport({ width: 794, height: 1122 }); // A4 size in pixels at 96 DPI
 
+        // NOTE: Stealth plugin handles most of this, but keeping for extra safety
         await page.evaluateOnNewDocument(() => {
             Object.defineProperty(navigator, 'webdriver', { get: () => undefined });
             Object.defineProperty(navigator, 'languages', { get: () => ['en-US', 'en'] });
             Object.defineProperty(navigator, 'plugins', { get: () => [1, 2, 3, 4, 5] });
         });
 
+        // Set up cookie and content bypass
         await bypassCookiesAndRestrictions(page, progressTracker);
 
+        // Block unnecessary resources (UPDATED: Block more aggressively, including scripts, fonts, and stylesheets if not critical)
         await page.setRequestInterception(true);
         page.on('request', (req) => {
             const resourceType = req.resourceType();
@@ -364,6 +357,9 @@ const studocuDownloader = async (url, options = {}, progressTracker = null) => {
             }
 
             if (
+                ['image', 'media', 'font', 'stylesheet'].includes(resourceType) && // Block non-essential images/media/fonts/styles early if not core
+                !reqUrl.includes('document') && !reqUrl.includes('page') && !reqUrl.includes('studocu') || // Allow core document images
+                resourceType === 'script' && !reqUrl.includes('studocu') || // Block third-party scripts
                 reqUrl.includes('doubleclick') ||
                 reqUrl.includes('googletagmanager') ||
                 reqUrl.includes('facebook.com') ||
@@ -382,18 +378,19 @@ const studocuDownloader = async (url, options = {}, progressTracker = null) => {
             }
         });
 
+        // Login if credentials provided
         if (options.email && options.password) {
             progressTracker?.updateProgress(12, 'authenticating', 'Logging into StuDocu...');
 
             console.log("🔑 Logging in to StuDocu...");
-            await page.goto('https://www.studocu.com/en-us/login', { waitUntil: 'domcontentloaded' });
-            await page.waitForSelector('#email');
+            await page.goto('https://www.studocu.com/en-us/login', { waitUntil: 'domcontentloaded', timeout: 60000 }); // Reduced timeout from 120000
+            await page.waitForSelector('#email', { timeout: 10000 }); // Reduced from 15000
             await page.type('#email', options.email);
             await page.type('#password', options.password);
             await page.click('button[type="submit"]');
             try {
-                await page.waitForNavigation({ waitUntil: 'networkidle2' });
-                await page.waitForSelector('.user-profile, [data-testid="user-menu"]');
+                await page.waitForNavigation({ waitUntil: 'networkidle2', timeout: 15000 }); // Reduced from 30000
+                await page.waitForSelector('.user-profile, [data-testid="user-menu"]', { timeout: 5000 }); // Reduced from 10000
                 console.log("✅ Login successful.");
                 progressTracker?.updateProgress(18, 'authenticated', 'Login successful');
             } catch (e) {
@@ -402,36 +399,34 @@ const studocuDownloader = async (url, options = {}, progressTracker = null) => {
             }
         }
 
-        progressTracker?.updateProgress(25, 'navigating', 'Navigating to homepage first for session setup...');
-        console.log(`📄 Navigating to homepage to simulate natural session...`);
-        await page.goto('https://www.studocu.com/en-us', { waitUntil: 'domcontentloaded' });
-        await new Promise(resolve => setTimeout(resolve, 3000));
-
+        // Removed homepage visit as it's not strictly necessary for session setup; directly navigate to URL
         progressTracker?.updateProgress(30, 'navigating', 'Navigating to document...');
         console.log(`📄 Navigating to ${url}...`);
 
         let navigationSuccess = false;
         let attempts = 0;
-        const maxAttempts = 5;
+        const maxAttempts = 3; // Reduced from 5 to minimize retries
         while (!navigationSuccess && attempts < maxAttempts) {
             try {
                 attempts++;
                 progressTracker?.updateProgress(30 + (attempts * 5), 'navigating', `Navigation attempt ${attempts}/${maxAttempts}`);
                 console.log(`Navigation attempt ${attempts}/${maxAttempts}`);
-                await page.goto(url, { waitUntil: 'domcontentloaded' });
+                await page.goto(url, { waitUntil: 'domcontentloaded', timeout: 60000 }); // Reduced timeout from 150000
                 navigationSuccess = true;
             } catch (e) {
                 console.log(`Navigation attempt ${attempts} failed:`, e.message);
                 if (attempts >= maxAttempts) throw e;
-                await new Promise(resolve => setTimeout(resolve, 15000));
+                await new Promise(resolve => setTimeout(resolve, 5000)); // Reduced retry delay from 15000 to 5000ms
             }
         }
 
         progressTracker?.updateProgress(40, 'loading', 'Page loaded, waiting for content...');
-        await new Promise(resolve => setTimeout(resolve, 5000));
+        await new Promise(resolve => setTimeout(resolve, 2000)); // Reduced from 5000ms
 
+        // Apply content unblurring
         await unblurContent(page, progressTracker);
 
+        // Wait for document content
         progressTracker?.updateProgress(45, 'loading', 'Waiting for document content...');
         console.log("⏳ Waiting for document content to load...");
 
@@ -442,7 +437,7 @@ const studocuDownloader = async (url, options = {}, progressTracker = null) => {
         let contentFound = false;
         for (const selector of contentSelectors) {
             try {
-                await page.waitForSelector(selector);
+                await page.waitForSelector(selector, { timeout: 10000 }); // Reduced from 20000
                 console.log(`✅ Found content with selector: ${selector}`);
                 contentFound = true;
                 break;
@@ -455,6 +450,7 @@ const studocuDownloader = async (url, options = {}, progressTracker = null) => {
             console.log("⚠️ No specific content selector found, proceeding with page content...");
         }
 
+        // Enhanced scrolling to load all content (Optimized: Increased scroll distance, reduced delays)
         progressTracker?.updateProgress(50, 'scrolling', 'Loading all document pages...');
         console.log("📜 Loading all document pages with enhanced slow scroll...");
 
@@ -463,25 +459,27 @@ const studocuDownloader = async (url, options = {}, progressTracker = null) => {
             let scrollHeight = document.body.scrollHeight;
             while (true) {
                 let totalHeight = 0;
-                const distance = 300;
+                const distance = 600; // Increased from 300 for faster coverage
                 while (totalHeight < scrollHeight) {
                     window.scrollBy(0, distance);
                     totalHeight += distance;
-                    await delay(500);
+                    await delay(200); // Reduced from 500ms
                 }
-                await delay(2000);
+                await delay(1000); // Reduced from 2000ms
                 const newHeight = document.body.scrollHeight;
                 if (newHeight === scrollHeight) break;
                 scrollHeight = newHeight;
             }
             window.scrollTo({ top: 0, behavior: "smooth" });
-            await delay(1000);
+            await delay(500); // Reduced from 1000ms
         });
 
         progressTracker?.updateProgress(70, 'processing', 'Processing loaded content...');
 
+        // Re-apply unblur after loading new content
         await unblurContent(page, progressTracker);
 
+        // Wait for all images to load (Optimized: Reduced per-image timeout, parallel wait)
         progressTracker?.updateProgress(75, 'loading_images', 'Loading images...');
         console.log("🖼️ Waiting for all images to load...");
 
@@ -492,14 +490,15 @@ const studocuDownloader = async (url, options = {}, progressTracker = null) => {
                 return new Promise((resolve) => {
                     img.addEventListener('load', resolve);
                     img.addEventListener('error', resolve);
-                    setTimeout(resolve, 15000);
+                    setTimeout(resolve, 5000); // Reduced from 15000ms
                 });
             }));
         });
 
-        await new Promise(resolve => setTimeout(resolve, 5000));
+        await new Promise(resolve => setTimeout(resolve, 2000)); // Reduced from 5000ms
         progressTracker?.updateProgress(80, 'finalizing', 'Preparing document for PDF generation...');
 
+        // Set exact height
         await page.evaluate(() => {
             const getDocumentHeight = () => Math.max(
                 document.body.scrollHeight, document.body.offsetHeight,
@@ -511,6 +510,7 @@ const studocuDownloader = async (url, options = {}, progressTracker = null) => {
             document.body.style.overflow = 'hidden !important';
         });
 
+        // Content verification (Unchanged, as it's quick)
         const contentCheck = await page.evaluate(() => {
             const textContent = document.body.textContent || '';
             const images = document.querySelectorAll('img');
@@ -537,6 +537,7 @@ const studocuDownloader = async (url, options = {}, progressTracker = null) => {
             console.warn("⚠️ Warning: Limited document content detected.");
         }
 
+        // Apply print styles and generate PDF
         await applyPrintStyles(page, progressTracker);
         await page.emulateMediaType('print');
 
@@ -545,10 +546,9 @@ const studocuDownloader = async (url, options = {}, progressTracker = null) => {
 
         const pdfBuffer = await page.pdf({
             printBackground: true,
-            preferCSSPageSize: true,
+            preferCSSPageSize: true, // Use the @page size
             displayHeaderFooter: false,
-            // --- FIX: Increased PDF generation timeout ---
-            timeout: 600000, // 10 minutes, increased from the default 30 seconds
+            timeout: 60000, // Reduced from 180000
             scale: 1,
             omitBackground: false
         });
@@ -588,16 +588,20 @@ app.post('/api/request-download', (req, res) => {
 
     console.log(`🎯 Processing request for: ${url} [Session: ${sessionId}]`);
 
+    // Respond to the client immediately with the session ID
     res.json({ sessionId });
 
+    // --- Start the PDF generation in the background ---
     studocuDownloader(url, { email, password }, progressTracker)
         .then(pdfBuffer => {
+            // Store the successful result
             downloadJobs.set(sessionId, { status: 'completed', buffer: pdfBuffer });
-            progressTrackers.delete(sessionId);
+            progressTrackers.delete(sessionId); // Clean up live tracker
         })
         .catch(error => {
+            // Store the error
             downloadJobs.set(sessionId, { status: 'error', message: error.message });
-            progressTrackers.delete(sessionId);
+            progressTrackers.delete(sessionId); // Clean up live tracker
         });
 });
 
@@ -606,6 +610,7 @@ app.get('/api/progress/:sessionId', (req, res) => {
     const tracker = progressTrackers.get(sessionId);
 
     if (tracker) {
+        // Job is in progress, return live data
         return res.json({
             sessionId,
             progress: tracker.progress,
@@ -617,6 +622,7 @@ app.get('/api/progress/:sessionId', (req, res) => {
 
     const job = downloadJobs.get(sessionId);
     if (job) {
+        // Job is finished, return final state
         if (job.status === 'completed') {
             return res.json({ sessionId, progress: 100, status: 'completed', message: 'PDF generated successfully!' });
         }
@@ -648,6 +654,8 @@ app.get('/api/download/:sessionId', (req, res) => {
         res.setHeader('Content-Type', 'application/pdf');
         res.setHeader('Content-Disposition', 'attachment; filename=studocu-document.pdf');
         res.send(job.buffer);
+        // Optional: Clean up the job after download to save memory
+        // downloadJobs.delete(sessionId);
     } else {
         res.status(500).json({ error: 'An unknown error occurred.' });
     }