Announcement
RimWorld update 1.7 swaps Unity for the in-house Waylith engine
Ludeon Studios reported 2–4x better performance than 1.6 in its tests; 1.7 was in unstable beta on October 12.
TLDR
On October 12, 2026, Ludeon Studios announced that RimWorld update 1.7 replaces Unity with its Waylith engine. Its tests showed 2–4x better performance than 1.6, though results may vary by PC and mods. The studio said 1.6 saves load in 1.7 and the vast majority of mods work unchanged. It offered 1.7 on Steam's unstable branch while the main branch stayed on 1.6. Ludeon also said it's working on another game using Waylith.
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