Time to First Byte (TTFB) is a crucial metric for ecommerce website performance because it is a direct measure of the time it takes for the server to start sending data to a potential customer’s browser. Modern ecommerce sites send a lot of server requests, so a low TTFB is a key indicator that the hosting infrastructure can provide efficient server responses. TTFB is key to deliver a fast user experience, which in turn increases engagement rates, boosts conversions, and lowers the chance of a user bouncing. It also enables better SEO performance as many search engine algorithms include site speed as a ranking factor.