Version 3.5.0 - high CPU usage after spewing a lot of scrollback

[Chap Harrison]

Just installed 3.5.0. When I run a program that spits out around 10M of data, performance becomes very sluggish and one core is steadily consuming 50% CPU. This persists after I clear scrollback buffer and only stops when I close the tab containing the session. 

MacBook Air M1 2020, macOS 14.5. 

Anyone else corroborate this?

[George Nachman]

Can you grab a sample? Instructions here: https://gitlab.com/gnachman/iterm2/-/wikis/HowToSample

Please file an issue with it.

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[Chap Harrison]

https://gitlab.com/gnachman/iterm2/-/issues/11496

[cpi...@gmail.com]

2019 Macbook Pro here running Monterey and I see 100% CPU usage even after closing ALL TABS. It finally died down after a minute. I already disabled disk logging as I haven't been need it. AFAIK AI stuff is disabled. What's is iTerm doing while NOTHING IS HAPPENING (8 tabs but none yet reconnected to a session when it was eating 100% cpu after a fresh restart.)   This is crazy. Good thing Terminal is semi useful cuz I may have to revert until this is fixed.

[George Nachman]

Please see my instructions below about how to sample the app.

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[Eric]

Hello, I have abnormal CPU use too, only 9 windows open, none running any process

[George Nachman]

That sample doesn’t show very high utilization - just the GPU renderer using < 10% or so. Maybe try to catch a sample again?

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[Eric Doughty-Papassideris]

It hovers around 15-30%, thing is this is completely idle, there is nothing running, all windows are waiting for input, so anything above 0 I'd call abnormal.

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[George Nachman]

It may be that you’re hitting some pathological case in the GPU renderer. I’m curious, does turning off Settings > General > Magic > GPU Renderer cause CPU utilization to down to near 0?

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