A slow site loses visitors, sales and ranking. Why a more powerful server almost never fixes it, which two numbers to check for free, and the real causes of slowness.
A slow PrestaShop isn't fixed by guesswork: you measure, find the bottleneck and act on the right layer, across hosting, PHP, MySQL, modules and caching.
What TTFB (Time To First Byte) is, why it affects user experience and SEO, what it depends on, and the general levers that help reduce it.
As of March 12, 2024, Interaction to Next Paint (INP) replaces First Input Delay among Google's Core Web Vitals. What it measures, the good threshold under 200 ms, and why it matters for user…