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Re:How to Optimise Your Website Performance by JamieAtBud on Friday October 21, 2016 @05:46AM (#12759200)
You can also test how mobile friendly your site is with google: https://testmysite.thinkwithgoogle.com/

Used this a few times on a few sites. The optimisation tips are very good and, considering this is free, its one of the most handy tools out there. Peace.