Valve plans to prepare Windows game code ahead of time to ease stutter on Arm
Proton ARM uses the FEX translator, and Valve wants its cache tied to Steam’s Pre-Caching feature.
Some devices use different chips from normal Windows computers, so games must be translated while you play. Valve wants to prepare the translation before a game starts. It has not said when.
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Why it matters
Windows games on Arm chips can stutter when code is translated mid-game; preparing it in advance helps.
Worth a look if you like to know how Windows games run on different chips.
The details
- FEX translates a game’s CPU code from x86 to Arm, while the OS and graphics drivers run natively.
- In September 2026, FEX developers added an on-disk cache that keeps translated code between sessions.
- An October FEX update added a default 1GB cache limit and cleanup of outdated caches after updates.
- The planned next step is linking it to Steam’s Pre-Caching before a game’s first run.
- Valve has given no date or performance numbers, and there is no broad independent testing yet.
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