What kind of answer are you expecting to get here ? The subject is very broad.
If you find a way to speed up Flarum, please describe it or better, write a PR 😉
Alkir …fonts/fa-regular-400.woff2(irkmix.top)
If the loading time of some resources are penalizing your website, you are free to extend Flarum to remove the things you don't personally need. If you don't use some FontAwesome icons, you could remove the font files and/or recompile them with only the icons you need.
Alkir can I enable gzip compression for pusher?
I'm not sure if that statement makes sense. Pusher uses websockets, if they can compress the data I'm sure they already do. Otherwise Pusher support would probably be the place to ask.