8000 COSMIC applications very laggy upon resizing · Issue #753 · pop-os/libcosmic · GitHub
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COSMIC applications very laggy upon resizing #753

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BrodieRobertson opened this issue Dec 12, 2024 · 18 comments
Open

COSMIC applications very laggy upon resizing #753

BrodieRobertson opened this issue Dec 12, 2024 · 18 comments

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@BrodieRobertson
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BrodieRobertson commented Dec 12, 2024 •
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Resizing COSMIC applications appears to be incredibly laggy, this does not occur with applications from any other toolkit.

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@git-f0x
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git-f0x commented Dec 12, 2024 •
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Not sure if this might be related to pop-os/cosmic-comp#883. The lagginess only affects libcosmic apps, but the High CPU usage during resizing might cause it.

@Adam-Cosner
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This is probably because of iced's full redrawing on every update, which should be improved once iced 0.14 comes out and libcosmic switches to it

@lazytanuki
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This is probably because of iced's full redrawing on every update, which should be improved once iced 0.14 comes out and libcosmic switches to it

I don't think it is the main cause, the issue wasn't present in the previous alphas.

@git-f0x
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git-f0x commented Dec 26, 2024

It was present for me for quite a while, I think even before the first alpha.

@idoric
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idoric commented Jan 11, 2025

This is probably because of iced's full redrawing on every update, which should be improved once iced 0.14 comes out and libcosmic switches to it

@Adam-Cosner What iced’s improvement are you referring to?

@Adam-Cosner
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@idoric Iced 0.14 added Reactive Rendering, when iced 0.14 fully releases and COSMIC integrates that it'll reduce resource usage

@lazytanuki
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When resizing the window, widgets will need as much redrawing with reactive rendering as they do now, since this updates the widgets.
In addition, the number of displayed widgets doesn't seem to have an impact on this issue. Resizing an empty COSMIC app window lags as much as resizing COSMIC files for instance.
So I don't think reactive rendering will fix this.

@Adam-Cosner
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Aha! At last I've discovered the cause of the issue. This is an issue with iced's WGPU implementation

@Adam-Cosner
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This appears to have been fixed in iced 0.14, so we just need for that rebase to happen

@Adam-Cosner
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Correction, on my investigation this is due to most libcosmic apps using the iGPU, which doesn't handle resizing very well.

@lazytanuki
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The issue is also present on desktop PC.
Btw I can confirm the issue wasn't present in Alpha 3, at least for me.

@Adam-Cosner
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Latest commits for cosmic-comp should have fixed this

@Quackdoc
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I am testing on pop-os/cosmic-comp@53d2cf0 for cosmic-comp and have the same issue with resizing still.

@Adam-Cosner
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@Quackdoc is the performance at least a bit better?

@Quackdoc
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going back and forth I can tell there is a difference, but there is still considerably lag.

@BrodieRobertson
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Just tested on my system and the resizing appears to be mostly functional now (not running at 3 FPS) but it does still feel kind of jittery.

@git-f0x
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git-f0x commented May 9, 2025

Is it fixed now?

@Quackdoc
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Quackdoc commented May 9, 2025

for me at least it is on a 4k 60fps display with 150% scaling. Resizing is smooth.

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@idoric @BrodieRobertson @lazytanuki @Quackdoc @git-f0x @Adam-Cosner
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