Hi there,
1. You can try adding the following snippet to a Hook Elememt:
<link rel="preconnect"
href="https://fonts.gstatic.com"
crossorigin />
<link rel="preload"
as="style"
href="$CSS&display=swap" />
<link rel="stylesheet"
href="$CSS&display=swap"
media="print" onload="this.media='all'" />
<noscript>
<link rel="stylesheet"
href="$CSS&display=swap" />
</noscript>
Set the hook to: wp_head
2. That warning comes from a wordpress function that is not easily changed, i am not sure but it may have been patched in WP 5.6
3. Thats not within our control, you can try tagging your ads with async – see here for more info:
https://techwelkin.com/load-google-ads-faster