NVIDIA Measures X.Org vs. Wayland Latency: No Clear Winner

The question of which is more responsive — classic X.Org or modern Wayland — has long been a heated topic among passionate Linux desktop enthusiasts. Some insist X.Org delivers the lowest latency; others cite personal impressions in Wayland's favor. NVIDIA decided to replace anecdotes with measurements.

At the annual XDC 2026 developer conference in Toronto — alongside the announcement of its Display Config Server project — the company presented the results of a scientific comparison of X.Org and Wayland latency. NVIDIA engineer Kamil Łysik measured the time from key press to presentation on screen.

How it was measured

To rule out subjectivity, a micro-controller with a light sensor was used for end-to-end measurement, paired with software for repeatable, automated testing. The tests ran on a GeForce RTX 5070 graphics card with the R610 driver branch. KDE KWin 6.7.4, GNOME Mutter 49.7, and X.Org Server 1.21.1.24 were all put through their paces.

The findings

NVIDIA's conclusion: the latency results for X.Org and Wayland are very close, making it hard to declare a clear winner. Among the notable takeaways — XWayland no longer introduces the extra frame of delay it once did. And Variable Refresh Rate (VRR) was found to "drastically improve" responsiveness, delivering roughly the same latency across both X.Org- and Wayland-based sessions.

That deprives a years-long debate of much of its fuel: under modern conditions, choosing between X.Org and Wayland on the basis of latency is no longer a decisive factor. The presentation is available in the conference materials.

Source: Phoronix