I'm running into some trouble with the DWM resolution limit in Windows. It looks like when my total pixel width exceeds 16384, visual effects get disabled and the system slows down significantly. I've heard the true limit might be 32767, but on my machine, performance starts to degrade as soon as I hit 16384. Is there a way to work around this limit or improve stability?
2 Answers
If you're on Windows 10 or 11, the resolution cap is usually tied to your GPU capabilities and the version of DirectX it supports since DWM utilizes DirectX for rendering. It's pretty uncommon for people to set up more than two 8K monitors or four 4K monitors, so there might be some unusual limits or bugs affecting your setup since it's not a common configuration.
You're right about the limits associated with DirectX. Modern Windows versions use DX11 for DWM, and all visual effects are rendered as a single large texture that covers your entire desktop. If you're using three 8K monitors side by side, you're exceeding the vertical texture size limit of 16384, which causes DWM to slow down and disable those visual effects. Unfortunately, there doesn't seem to be a workaround for this issue.
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