Scoring 100/100 in Google PageSpeed Insights, GTmetrix PageSpeed and Yslow (and why you probably shouldn't bother ;) - - Premium WordPress Themes

Don't let yourself get fooled by the title. You should definitely care about your site performance and using those tools allows you to identify problems easily. In general you get very good recommendations but you should know when to follow them and when to ignore them :) The metric that is much more important than

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Why are the GTMetrix and Google PageSpeed Insight results so contrasting for my website? - Quora

How we increased our Google Pagespeed score from 35/100 to 89/100 - Create and Code

How to Reach 100 in Google PageSpeed Insights (on WordPress)