[Webkit-unassigned] [Bug 135387] [Mac, iOS] Video upload to texture performance way too slow

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=135387

--- Comment #10 from Marcin <msokalski at novomatic-tech.com> ---
Hey Kimmo, please find attached thing.

First of all epilepsy warning, the test blinks a lot to make it easier to detect presentation drops.

Also please note blinking background temporarily burns your screen (only apple screens) it goes away after 15 mins or so. This is super interesting whats going on here but it's out of this issue scope :)

Provided video files come in two formats (mov and webm) so you can test it against chrome or firefox as well.

1) Results on my iPhone SE ~ 2017 14.4.1 and iPad Air 2020 14.4.1

   1.1 paused movie 
       - performance 60fps
       - no visual presentation drops

   1.2 playing movie with texture updates at 10FPS
       - performance 60fps
       - HEAVY presentation drops!!!!!!! why?

   1.3 playing movie with texture updates at 60FPS
       - performance 60fps
       - no visual presentation drops (interesting right?)

2) Results on my iMac ~ 2017 Catalina 10.15.7, Safari 14.2 TP 122

   1.1 paused movie 
       - performance 60fps
       - no visual presentation drops

   1.1 playing movie (texture update rate makes no difference here)
       - performance 60fps
       - random visual presentation drops, 
         (intensifies with more pressure on CPU/GPU)

Zip file contains alternate video files (puppets), results with it are much better on iMac but causes same heavy drops on iPhone.

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