pepitillo 11 Posted December 2, 2020 Share Posted December 2, 2020 Hi there, I have installed Big Sur on my computer and I noticed high CPU usage when playing 1080p+ videos on both Safari and Chrome. I'm using a RX 580 as main graphics backed up with my Intel HD 530 internal display activated for computing (as the iMacs do). Has anyone noticed this behaviour on Big Sur? Is there any adjustment to do? I'm using OpenCore. Thanks. Link to post Share on other sites
fantomas 4,058 Posted December 2, 2020 Share Posted December 2, 2020 Hi What happens when you turn off the use of hardware acceleration? Spoiler Link to post Share on other sites
pepitillo 11 Posted December 2, 2020 Author Share Posted December 2, 2020 I have the same behavior. As I can guess, expected behavior is to use 4k decoder from the iGPU, isn't it ? Or maybe from the AMD graphics card ? For sure, this work shouldn't be done with the software render. Link to post Share on other sites
pepitillo 11 Posted December 2, 2020 Author Share Posted December 2, 2020 I've tried playing Asphalt 9 (it's great on Catalina) and I feel a little sluggish. It uses big amount of CPU too. Link to post Share on other sites
pepitillo 11 Posted December 7, 2020 Author Share Posted December 7, 2020 (edited) Update : I realized that playing a video on Catalina (Safari) uses IGPU HD 530 (Good). The same video uses the CPU directly on Big Sur (Bad). Link tio video. https://www.youtube.com/watch?v=LXb3EKWsInQ Playing on both OS on Safari 1080p60 I haven't any injection of IGPU on my OpenCore config. Decoding may be changed on Big Sur Safari. Don't know if there's something to do to revert to the old behavior. Edited December 7, 2020 by pepitillo Link to post Share on other sites
pepitillo 11 Posted December 9, 2020 Author Share Posted December 9, 2020 If someone is interested, I've managed to bypass the problem disabling VP9 codec in Safari Develop options. The downside is that you cannot play videos above 1080p, but my CPU is happier and cooler. :) Source : https://developer.apple.com/forums/thread/663850 Link to post Share on other sites
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