According to Google, the average mobile page takes more than 7 seconds to load. If this is the case with your site, it’s important to identify the issue and rectify it – people are notoriously impatient on the web and are likely to click away rather than wait. But page load speed is only part of the problem.
If your page loads quickly, but users still have to spend time pinch zooming and scrolling in order to read the page, the speed of load seems immaterial. It’s frustrating to users to click on promising links, only to have to spend more time ‘clarifying’ the page before they can be sure they are where they want to be.
Google has recently updated PageSpeed Insights with additional recommendations on mobile usability. By interrogating these reports it should be possible to see the extent of your speed/usability issue and to put in place the necessary steps to solve any problems.