The SteamOS 3.7.20 beta, launched on 2026-01-08, includes kernel-level support for ntsync, which enhances the performance of legacy Windows games on Linux systems like the Steam Deck. This update primarily benefits older games, such as Call of Duty titles.
Enhanced Game Performance
The ntsync driver aims to boost frame rates in games that struggle with fsync, an existing feature of SteamOS. Limited testing shows that using Proton-GE with ntsync can provide slight frame rate improvements, such as increasing from 130–140 FPS with fsync to 135–144 FPS with Proton-GE in Call of Duty 4: Modern Warfare.
- SteamOS 3.7.20 beta launched on 2026-01-08.
- ntsync offers better Windows game performance on Linux vs. fsync.
- Frame rates improved slightly with Proton-GE and ntsync integration.
- Call of Duty Black Ops users report resolved frame rate issues.
Practical Use and Community Feedback
Users wanting to use ntsync can access it by opting into the SteamOS 3.7.20 beta and installing the latest Proton-GE via the Proton Up-Qt app. Community reports suggest that ntsync and Proton-GE have addressed severe performance issues in some games, including graphical improvements and resolution of frame rate drops in specific titles.
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