what is this coreanimation.offscreen encoder mean ?

this encoder happens to make gpu bubble, wondering what it is , and how to get rid of it, thx.

I found this situation caused by the white bar the bottom of the screen,if i get rid of it via system settings,my render passes will run normally,but why ? I just don't get it?

Apparently, the new version of Instruments records traces of other processes that utilize the GPU while your process is running. This adds a lot of noise to the profiling data.

what is this coreanimation.offscreen encoder mean ?
 
 
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