Windows borderless position hack does not play well with some monitor layouts

Describe the bug: When running in Borderless mode, the osu client appears to be running at 60fps, although the fps counter says 500+fps (and so does fraps). When running in Fullscreen or Windowed mode, the game appears to be as smooth as it should be.

Furthermore, disabling my other monitors (which are 60hz) also fixes Borderless mode and makes it appear as smooth as it should be. Note that the monitors weren’t being used for osu, just by being enabled in Windows they cause this strange performance degradation.

This issue does not exist on the stable client.

Screenshots or videos showing encountered issue: n/a

osu!lazer version: 2021.416.0

Logs:

network.log performance.log runtime.log updater.log database.log

[Susko3]

This is still an issue. The game doesn’t render on the other display with https://github.com/ppy/osu-framework/pull/5068, but the window still extends and DWM forces it to the lowest common framerate. (I don’t have a way to test this, but I presume this is what happens.)

Veldrid / “compatibility mode” (https://github.com/ppy/osu-framework/issues/4909) should fix this, as it uses native DirectX fullscreen/borderless.

Another fix may be improving the borderless hack so the 1px extension avoids other displays (for this specific configuration, extending 1px to the top or bottom is amicable). This is easier said than done as explained in https://github.com/ppy/osu-framework/pull/5068.

[peppy]

Closing as should-be-resolved.

Please feel free to reply in this thread if you can still reproduce an issue.