Where to install AMD GPU drivers?

I've got a R9 290 Sapphire and I've installed MacOS 12

long story short, I've spoofed it, it's detected, refresh rate is 144 hz but the system is still slow, youtube playback it's impossible, minimizing animations is slow and glitchy, and I can't activate the acceleration since the VDA Decoder test fails.

I think that what is missing are drivers for that GPU, since I've not installed them till now, but the question is, where do I find them?

I've searched a bit on the internet and found nothing.

Thank you in advance if you'll spend a little bit of your precious time helping me, this is my first Hackintosh install.