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Measuring input latency on Linux: X11 vs Wayland, VRR, and DXVK - Marco Nett (marco-nett.de)

submitted 6 days ago by e8d79@discuss.tchncs.de to c/linux@programming.dev

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Really cool research. Overall, X11 still wins compared to Wayland(kwin) but only by 0.14 - 0.22 ms. The really bad performance hit is from XWayland which added 3.13 ms.

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[–] Chewy7324@discuss.tchncs.de 3 points 6 days ago* (last edited 6 days ago) (1 children)

Latency is compounding. There's no point where less latency is not better. It's completely irrelevant how fast my reaction time is, as removing 3ms from the system latency allows me to start reacting 3ms earlier.

Edit: I do agree though, that 3ms more or less is not a deal breaker. I'be been playing on Wayland for many years. But not being a deal breaker does not mean it's not a big deal.

[–] kogasa@programming.dev 1 points 6 days ago

The 3ms figure is nonsense anyway. 2ms of that is just bad scheduling/presentation config that disappeared when using dxvk-low-latency. Use native wayland or Gamescope+WSI and you're within 1ms of X11 generally.