MC-234138Extremely high kernal_task usage on macOS
kernel_task consistently uses around 1000% CPU (2.4 GHz 8-Core Intel Core i9) when Minecraft is running. Game runs at extremely low frame rate (about 3 fps) even in menu.
Please let me know what files or logs I need to provide.
Environment
macOS 12.0 Beta (21A5294g)
Minecraft 1.17.1
Created Issue:
Extremely high kernal_task usage on macOS
kernel_task consistently uses around 1000% CPU (2.4 GHz 8-Core Intel Core i9) when Minecraft is running. Game runs at extremely low frame rate (about 3 fps) even in menu.
Please let me know what files or logs I need to provide.
Environment
macOS 12.0 Beta (21A5294g)
Minecraft 1.17.1
![[Mod] Michael Wobst](../../../data/avatars/users/37868.png){kind=small}
Added Category: Performance
Removed Category: (Unassigned)
Can confirm similar behavior. On my machine (older MacBook Pro), 1.17.1 runs in full-screen mode for a few minutes before kernel_task goes bananas and the game comes to a crawl. Exiting full-screen mode corrects the behavior. Returning to full-screen mode causes the cycle to repeat (few minutes decent performance, then overly high CPU usage).
Fiddling with video/Java settings has had no effect.
similar behavior on MacBook Pro 16-inch 2019 with 64GB RAM - starting Minecraft spikes kernel_task up to 900% CPU and game lag / graphics performance is terrible despite having an 8 core Intel Core i9 with AMDRadeon Pro 5500M with 8GB VRAM, would love to get that fixed, let me know if I can assist. Also adjusting video/Java settings has had no effect.
Please check if this is still an issue in the most recent version of the game.