@jaswantwe said in High cpu usage watching youtube:

Make sure hardware acceleration is enabled or this won't work
(If you can't find hardware acc, go here opera://settings and type in "hardware acceleration")
Go to opera://flags/#ignore-gpu-blocklist
Enable that setting, relaunch and you should be good.

Thankyou! This worked for me, current 89.0.447.83 W10 64 bit - years after this thread began!

Thing is, for years I've had no trouble, until about 3 weeks ago. I could have 40 tabs open and still play YouTube. Since when it deteriorated to the point where just one tab would drop frames and eventually stall using 100% CPU.

Clearing cache and a restart would then be needed before I could browse anything

Your fixes worked - although I still note load is halved if I hover over the You Tube animated tab. Alas I can find no setting or flag to fix that in the current version.