Reduce HTML output to boost performance & SEO

[Alpha1]

XF2.3 has greatly boosted performance. I hope that further improvements can be made by optimizing the HTML output. A GTMetrix report for XF2.3 shows excessive DOM size with almost 3400 elements on a page and 103 child elements :
https://gtmetrix.com/reports/xenforo.com/A5Ttit73/
Maybe waiting time for the page to load can also be reduced?

I hope that addon developers will posts their feedback on further boosting performance to this thread.
Reduce HTML output to boost performance & SEO

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