RimWorld 1.7: Waylith engine, Unity replacement and 2–4x faster
RimWorld update 1.7 reportedly replaces Unity with Ludeon Studios’ Waylith engine, promising faster startup, loading, and performance.
- The sources mention a 2–4x performance boost, with faster startup, shorter load times, and better ticks per second.
- The update appears to have been available at least through a Steam beta or unstable branch, but the exact rollout scope is not fully clear in the sources.
What happened
A Reddit post in r/gaming kicked off the discussion with the claim that RimWorld no longer runs on Unity, but on a new in-house engine called Waylith. The post tied the alleged switch to a 2–4x speed increase and also claimed that mods still work after the change.
Secondary coverage then followed, describing the engine swap as part of RimWorld update 1.7. Those articles refer to an announcement from Ludeon Studios saying the game should look and play the same, but run faster under the hood. The reported improvements include startup, load times with large mod lists, map and world generation, and ticks per second.
One concrete example mentioned in the secondary source is a late-game colony with 1,500 mods, where load time reportedly dropped from 14 minutes on Unity to 6 minutes on Waylith. The sources also say PC players could try the update through an unstable Steam branch or beta, though the material provided does not fully clarify how widely it had been rolled out at that point.
Timeline
2026-10-12 — Secondary reporting says Ludeon Studios announced RimWorld update 1.7, including the move to the Waylith engine.
2026-10-12 — The same reporting says the game runs faster on Waylith, with improvements to startup, load times, and simulation performance.
2026-10-13 12:52:39 — A Reddit post in r/gaming repeats the claim that RimWorld has moved from Unity to Waylith and says it is 2–4x faster.
2026-10-13 17:28:35 — Further secondary coverage cites a test with 1,500 mods and a load-time reduction from 14 minutes to 6 minutes.
2026-10-12 — Ludeon Studios reportedly announced update 1.7 with the Waylith engine and technical performance improvements.
2026-10-13 12:52:39 — A Reddit post in r/gaming claims RimWorld has switched from Unity to Waylith and become 2–4x faster.
2026-10-13 17:28:35 — Game Rant reports a test with 1,500 mods and a load-time drop from 14 to 6 minutes.
Background
RimWorld is a PC colony sim that has traditionally been associated with Unity. In the supplied sources, Waylith is described as Ludeon Studios’ own engine, but the primary announcement itself was not included directly in the source set.
The 2–4x performance claim appears in both the Reddit post and the secondary reporting, but the underlying measurement method is not fully explained in the provided information. That leaves it unclear whether the improvement applies to all systems, specific saves, or test cases with heavy mod lists.
Mod compatibility is also mostly presented as a claim in the sources. There is an example involving a large mod set, but no full list of tested mods, versions, or technical details showing how compatibility was verified.
Sources
- Reddit post in r/gaming: "RimWorld switches from Unity to their own new..."
- Game Rant: report on RimWorld, Waylith, and update 1.7
- Provided external context on Ludeon Studios and update 1.7