Getting incredibly slow WebGL build times on some projects, but not others???

I've tried changing the Anti-virus settings to exclude the build folders and Unity installations, but this is very weird behaviour???

Some projects build fine to WebGL but still take a few minutes and others seems to get stuck in a loop using up very little processing power but not moving forward.

Starting to think my PC is compromised and someone is just F***ing with me!

Anyone else getting strange build behaviour between WebGL projects?

Could I be missing some cache or temp folders that are used in the build process where my Anti-virus will kick in and slow things down to a crawl?

 

do you have compression enabled in build settings? (i've had brotli builds take over 1hr..)

 

It's grinding to a standstill in earlier phases e.g. IL2CPP just seems to be very slow but use up very little processing power!?

Actually just running a test build and stripping assemblies seems to be incredibly slow or a failure point!