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What’s the cpu usage like using 4k in YouTube in Big Sur?

Is it hardware accelerated?
I'm getting between 10-25% CPU usage. There does not appear to be any hardware acceleration to the GPU in Safari.
 
I’d go with major hardware acceleration. I just got done watching YouTube on my 4K TV for about an hour playing back from my Air and I was startled when I unplugged it and picked it up at the end and it was completely cool to the touch. Like it had been sitting turned off.

Here is a little playback video showing power usage and percents. Note that the screen recorder is also running and probably using up more power than the playback.

 
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