Measure the impact of your page load time
It’s sometimes easier to get convinced when numbers are involved.
If the statistical figures previously mentioned were not enough to build a case for speed, here’s Google’s Impact Calculator.
Previously a separate tool, it’s now part of Google’s Test My Site feature, which you can also use to test the speed of your mobile site and compare it with up to ten of your competitors.
The Impact Calculator estimates how much you can gain from decreasing your loading time by as little as one second (the number can be further adjusted according to your own speed goal):
You simply enter your current site speed, average monthly visitors, conversion rate, and average order value, and the tool will give you an approximate number of earnings you could have if your site was faster—or the numbers that you may be losing because your site is loading too slow.