XenForo Reducing CSS for guests. How?

A

Anatoliy

Guest
I'm checking my forum with Google Pagespeed Insights and it says:
Eliminate render-blocking resources (/css.php?css=...)
Reduce unused CSS (/css.php?css=...)

Chrome dev tools under Coverage says that 92.7% - Unused (/css.php?css=public%3Anormalize.css%2Cpublic%3Afa.css%2Cpublic%3Acore.less%2Cpublic%3Aapp.less...)

I'm looking in and see classes(?) that are not related to guests, like .inlineModBar-..., .p-staffBar-..., etc. I understand the concept "it's for the first time loading...

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