Improve pagespeed score?

Hello

A Google tool give speed score :
https://developers.google.com/speed/pagespeed/insights

If I check my discourse forum, I see desktop is 94%, and mobile very poor (26%) !


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Howto improve forum speed ?
Google says it is very important for the ranking…

(Root site is 100 %, with many Ajax dynamic calls.)

Many duplicate topics on this feel free to search.

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