The "Texture Paint" mode is very slow. #101966
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Reference: blender/blender#101966
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System Information
Operating system: Arch Linux, Windows 10/11.
Graphics card: RTX 2070, RTX 3070Ti.
Blender Version
Broken: All version 2.83 - 3.3.
Worked: Never worked.
Short description of error
The "Texture Paint" mode is very slow. I have a powerful video card, but even a 1024*1024 texture is slow when drawing.
Peek 2022-10-21 07-55.mp4
Added subscriber: @imlegr
Added subscriber: @mano-wii
Changed status from 'Needs Triage' to: 'Needs User Info'
I noticed in the video that Mesh has the Subdivision modifier. Is it also slow without this modifier?
Does the
GPU Subdivision
option in the preferences make any difference?Please open Blender's installation directory and double click on the
blender_debug_gpu.cmd
. This will start Blender in debug mode and create log files.Try to reproduce the error again.
Once you close Blender manually the Windows Explorer should open and show you up to two files, a debug log and the system information.
Add them to your bug report by clicking on the upload button as shown in the screenshot below or via drag and drop.
Lags both with and without the Subdivision modifier.
GPU Subdivision is enabled. I am currently on an Arch Linux computer. How do I start debug mode in Linux?
Please run
./blender --debug-gpu > gpu_debug_log.txt
from the command line, trigger the bug, and attach the resulting file here.https://docs.blender.org/manual/en/latest/advanced/command_line/launch/linux.html
Also provide the
system-info.txt
generated in {nav Help > Save System Info}.I did everything like you said.
Peek 2022-10-21 20-03.mp4
system-info.txt
gpu_debug_log.txt
Changed status from 'Needs User Info' to: 'Confirmed'
I can see some messages that might be related. But I'm not sure if it's enough to reveal where the problem is:
It might take a developer with similar hardware to test.
I'm confirming the issue anyway. for the #eevee_viewport team to take a look at.
In the meantime, please double-check if the drivers are up to date.
To upgrade to the latest driver, see here for more information: https://docs.blender.org/manual/en/dev/troubleshooting/gpu/index.html
I have all the drivers and all the applications are the latest and freshest. I use Arch Linux and here everything is updated with one command: paru -Syu.
Added subscriber: @Jeroen-Bakker
Changed status from 'Confirmed' to: 'Needs User Info'
It is hard to know what is going on, so I need more info. I doubt that the warnings are that harmful.
In order to continue we need a reproducable report. A hint would be to use some profiling tools to find out where the slowdown is. Are you familiar with tools like hotspot, perhaps you can provide us with a hotspot recording to detect where the bottleneck is. (https://github.com/KDAB/hotspot, but most distros provide it via its package manager)
Changed status from 'Needs User Info' to: 'Archived'
No activity for more than a week. As per the tracker policy we assume the issue is gone and can be closed.
Thanks for the report. If the problem persists please open a new report with the required information.