If you got Ryzen 5 4500u and running Linux mint 20.2, you should consider switch to kernel 5.8,
without kernel 5.8, youtube 4k video was lagging and use 90% CPU, Once switching to kernel 5.8. the 4k video only use 30% CPU.
Linux Mint 20.2 with Ryzen 5 4500u
November 1, 2021