[Galaxy Grand Duos i9082 Q&A, Help & Troubleshootin] Bhargav97:
Hello,

Something went really serious with my device. I just don't have any idea! Please read on and help...

So, this was my fresh start with customization in my Galaxy Grand Duos (GT-I9082). I wanted cm-11.0 in my phone and I planned to install [MENTION=3117667]pawitp[/MENTION]'s recovery as he said in his thread. And I installed it using odin 3.09. But after odin said "PASS", the phone rebooted to system (as expected). Then, I switched it off and then tried going to recovery by key combination but the phone rebooted to stock android recovery. I was new to Grand and so I researched on net and found that in few stock roms of Galaxy grand, the odin cannot detect the block where to flash the recovery and so recovery foesn't flash in correct block.

So, I downloaded latest Indian stock ROM from Sammobile (Yes, my device is purchased from India). To be precise, this one: http://www.sammobile.com/firmwares/3/?download=25333

And flashed it. The process was over in 2-3 mins at max. Then, after the first boot, phone was little bit laggy. I thought, it would become smooth after sometime and didn't bother. Then I installed [MENTION=3117667]pawitp[/MENTION]'s recovery and it flashed and was working fine. Then, I installed v1.51 CF-Root zip, because I had root to use Titanium Backup for few apps. It got installed successfully. Now, I rebooted to system and what I felt was a terrific slow phone (I mean my each and every word). It took 3-4 minutes to open dialer. It was smooth at times for 2-3 seconds but again extreme lag. I thought, I should wipe data and to do that I went to recovery and did a data-wipe/factory-reset. Now, phone took 13-14 mins to boot-up (I know it builds dalvik-cache but it should takke 3-4 minutes at max). After it booted up, I was presented setup wizard and it took me 20-25 minutes to complete this wizard. What I mean is, it was still extreme laggy rather it was more laggy than earlier.

Here comes a very bad thing then:

Now, I thought of going to recovery and flash cm11 zip file. But, when I booted to recovery, I got a black screen with a "clockworkmod recovery 6.0.4.5" text at bottom and the whole recovery layout came after waiting 1-2 minutes! So, it just got me in a very bad tension. It was laggy even in recovery!! Now, I decided to flash stock ROM again and started flash using odin. But, the most dangerous thing happened: It was laggy/extremely slow in download mode even!!!!! It took 53 minutes to complete the flash!

Now, the phone was in same condition. :'(

I just thought of doing a factory reset using this stock recovery and then I did a 'Factory Reset' from inside the system (Settings > Backup & Reset > Factory Reset).

Now, my phone became fast. And I got a BIG relief. It still feels slow at times but is reasonably fast, atleast till now (15-16 hours after factory reset).

What is my question then?

What just happened that made my phone extremely slow in Download Mode, Recovery and ofcourse System?

I need a satisfying answer please...

One more thing: I have habit of pulling out battery to switch the phone off when odin says "Pass" (I'm lazy to wait for it to complete boot), if I have to use recovery.