I updated the original question with my solution to help others.
Nodebb ranks poorly on PageSpeed Insights
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I just ran "PageSpeed Insights" on https://community.nodebb.org/ and it ranks poorly.
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Chipping in with my results
Mobile:
- Speed: 61/100
- User Experience: 99/100
Desktop:
- Suggested Summary: 77/100
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Mobile
- 70/100 Speed
- 100/100 User Experience
Desktop
- 85/100
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Mobile
- 71 / 100 (speed)
- 100 / 100 (user experience)
Desktop
- 85 / 100 (suggestions summary)
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Interesting to see many getting much better results
Just tested with Firefox and this time it's closer to what @pichalite got
58 / 100 (mobile)
74 / 100 (desktop)- Eliminate render-blocking JavaScript and CSS in above-the-fold content
- Leverage browser caching
- Minify JavaScript
- Minify CSS
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@peter setting the number of recent posts on the homepage to 0 got me my 100% usability on mobile. As it removes a lot of the padding issues that it complains about, read more being the main culprit. It's not big enough for mobile.