Speed: why slow sites sink

So far this module has been about what your pages say. The next two lessons are about how they behave — because Google measures that too, and so, far more ruthlessly, do humans.

The numbers first: on phones, most visitors abandon a page that takes more than about three seconds to appear. They do not complain or wait — they just leave. Back to the results, next blue link. And Module 1 showed exactly what that pogo-stick teaches Google, at scale, about your page.

Measure first: PageSpeed Insights

Never guess about speed — measure it. Google gives you the measuring tool for free.