I have been noticing this too.
Only for the last few weeks. Was fine for years before then.
CPU usage is super high in Win 10 even with just 1 or 2 tabs open.
I checked task manager and it is the browser itself that is using all the cpu.
Have 0 extensions running and cpu is high on brave only.
Wasn’t like this a month ago, but now it is really heavy on the CPU.
Just to add, no hardware acceleration is not enabled nor are any extensions.
Doesn’t matter the site either.
I clear cookies and cache daily so ain’t that either.