Regression: Blender 3.1 UI editor resize /border dragging performance #97272
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Reference: blender/blender#97272
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System Information
Operating system: Windows-10-10.0.19044-SP0 64 Bits
Graphics card: NVIDIA GeForce RTX 2080 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 512.15
Blender Version
Broken: version: 3.1.2, branch: master, commit date: 2022-03-31 17:40, hash:
cc66d1020cWorked: 3.0.1
Caused by {6738ecb64e8b6d0c1f5a79f1e63f468b4138de19}
Short description of error
Resizing UI editor panels in Blender 3.1 is significantly slower (framerate) and laggier than it was in 3.0. This is not related to the UV Editor performance regression as it happens even when there's no UV editor displayed in the given workspace.
Here's a video of the issue, recorded at 60FPS and slowed down to 50% so the issue is more apparent: https://www.youtube.com/watch?v=a0wzLgkf6mk
Exact steps for others to reproduce the error
Result: The UI redraw framerate and input response (lag) are worse than in Blender 3.0
Expected: The UI redraw framerate and input response (lag) are same or better than in Blender 3.0
Added subscriber: @Rawalanche
#97680 was marked as duplicate of this issue
Added subscribers: @Jeroen-Bakker, @lichtwerk
Changed status from 'Needs Triage' to: 'Confirmed'
This is apparently caused by {6738ecb64e8b6d0c1f5a79f1e63f468b4138de19}
Think this already mentioned in #95428 (Regression: 3.1 & 3.2 Image/UV Editor poor performance (Byte textures, window dragging, maximizing area))
Test 2though... Maybe we should split these up in two reports, @Jeroen-Bakker?Blender 3.1 UI editor resize performance regressionto Blender 3.1 UI editor resize /border dragging performance regressionBlender 3.1 UI editor resize /border dragging performance regressionto Regression: Blender 3.1 UI editor resize /border dragging performanceAdded subscriber: @Xorrito
Added subscriber: @RafaelPasquay-2
Added subscriber: @oliveiralberto
Added subscriber: @Julian-Szigethy
Although I see that there is a difference. The change that introduces the regression fixes a much higher prio bug. I suggest that we keep this around until we need to support these faulty OpenGL platforms.
Could
6738ecb64ebe made platform specific then (so not everyone has to suffer from this)?This doesn't make sense. So we get very severely reduced performance across the entire Blender UI just because someone's obscure old laptop GPU had a driver issue? O_o
Added subscriber: @Slowwkidd
Too bad this is not considered a high priority, Blender always had smoothness in its UI as one of its cornerstones, it's a pity we had such a downgrade and the devs don't feel the need to fix this as soon as possible. Between this and the UV/mage Editor regression, I feel the features of this last release are overshadowed by these UI important downgrades. I hope that at least for 3.2 this will be fixed.
This issue is even worse, as it causes very short but very uncomfortable lag when adding new nodes inside a node editor. Just in general, the node editor now suffers from frustrating short lags.
Added subscriber: @HooglyBoogly
I have been checking around and it seems to be that on my system the lag isn't that bad as on other work stations. I am looking into something that will remove this on workaround in known cases.
Thanks for your patience!
This issue was referenced by
439f86ac89@Rawalanche that doesn't seem related to this issue. could you report it in a new issue?
@Slowwkidd I find that a not running system (crashes, shader compilations errors, malfunctioning functionality) is more important that a performance regression. I mean with the other you cannot work, with a performance regression it is annoying, but you can still work.
I think that anyone would agree with that. So when having limited time I prefer to work on the first category of issues.
Although we haven't been able to reproduce this issue on multiple machines in the studio I will commit a potential fix.
As we aren't able to reproduce it is very hard for a developer to fix this. On my machine (Linux AMD Ryzen 3800, NVIDIA 1080) that is fixed to 60fps I get 60fps when resizing a viewport (except the uv/image editor or when using eevee) for the uv/image editor I get 30 fps.
@Jeroen-Bakker I could, if you want me to, but this issue is reproducible in exactly the same build as the resize lag issue. When I test the blender builds prior to the change, the lag when adding new nodes is not there either.
Would be great if you could @Rawalanche
Added subscriber: @JanKaderabek
Hi,
while trying to reproduce it, I found out that it was caused by the per-application nVidia driver power management mode being reset to default value, after doing a clean driver reinstall earlier. This setting is known to cause some lag in Blender, and it seems it has aggravated the performance issues.
This is my bad. While the power management mode does not solve the UI border resize lag, it did solve the short lag after adding the nodes. So nevermind :)
@Rawalanche thanks for letting us know!