How to Test Site Speed
There are several ways to test your site’s speed: Google’s Page Speed Test and webpagetest.org are good places to start. They’ll show you the types of elements your site is using, like images, videos, fonts, and services, and whether any of them are slowing you down.
From there, making improvements could be as simple as resizing images that are too large, or more complicated, like changing your page’s development to load critical elements first and supplementary content in the background.
Of course, there are always factors you can’t control—like the data limits of your customers’ cell phone plans. By optimizing where you can, you improve your ability to meet people’s needs despite those limitations.