It could also be because of chrome being uncapped, check if your browser’s FPS is capped. With FPS uncapped, browser will use all resources just to maximize render rate.
There’s a chance you have hardware acceleration for chrome disabled (When disabled, all sort of apis and features will be run in software, aka on the cpu INCLUDING any sort of 3D rendering). So if that’s really the case, then just go to the chrome settings page, go over to “System” and switch on “Use hardware acceleration when available”. Hopefully this helps.
While technically disabling hardware acceleration could potentially improve performance, most of the times it might just end up degrading it instead for a theoretical 1-10 fps increase that would only really apply to weak or old hardware. Seeing your specifications, there is no real benefit for you to disabling hardware acceleration of chrome at all, along with the hardware acceleration of other applications too. Only real reason i see for disabling hardware acceleration for your system would be if you were placed in some sort of ultra tight gpu memory limitation issue where you would need to get every megabyte of video memory available from your gpu in some ultra specific workloads or applications that cannot even start using system memory as additional video memory.
