RimWorld Ditches Unity for a Custom Engine, Promising Up to 4x Better Performance in Update 1.7
Key Takeaways
- RimWorld Update 1.7 replaces Unity with the custom Waylith Engine, capable of quadrupling game performance.
- Save files remain fully compatible, and loading times for heavily modded games drop from 14 to six minutes.
- Ludeon Studios confirmed they are currently using the new Waylith Engine to build a second, unannounced game.
Ludeon Studios confirmed that RimWorld is officially transitioning away from Unity after thirteen years of continuous development. The upcoming Update 1.7 rebuilds the foundational architecture on Waylith, a custom proprietary engine developed entirely in-house.
The developer outlined the technical transition in a comprehensive update on the Ludeon Studios blog. While core visual styles and game balance remain unchanged, the new architecture significantly improves simulation processing for resource-heavy colonies.
What Performance Gains Does the Waylith Engine Bring to RimWorld?
The Waylith Engine increases RimWorld performance by two to four times compared to version 1.6. Stress tests demonstrate a 2.2x speedup in late-game colonies featuring heavy entity counts. Load times for setups with 1,500 active modifications drop from 14 minutes down to 6 minutes across compatible systems.
Ludeon Studios highlighted measurable improvements in tick rates, startup speeds, and world generation routines. Late-stage colonies managing hundreds of pawns and animals experience fewer frame drops and simulation pauses.
Internal testing confirms that the engine processes complex pathfinding and environmental checks far more efficiently. System resources remain stable even during massive raid encounters or extensive map expansions.
Announcing RimWorld update 1.7! It moves the game from Unity to the Waylith Engine, our own in-house engine. In our tests, RimWorld runs 2-4x faster. You can try it now on the unstable beta. Oh, and RimWorld isn’t the only game on Waylith… Read on Steam: https://t.co/WT4qrvMYzq
— Ludeon Studios (@LudeonStudios) October 12, 2026
Save File Compatibility, Modding Enhancements, and System Requirements
Update 1.7 provides seamless save file mobility without requiring external file converters. Saved games from version 1.6 launch directly in version 1.7, and saves created within version 1.7 remain backward-compatible if players revert to version 1.6.
Community modifications transition smoothly without mandatory rewrites from mod authors. Certain add-ons display yellow interface warnings due to the version increment, but underlying scripts retain functionality. The Waylith Engine grants mod creators full support for modern C# language features.
Creators can implement demanding visual shaders and complex custom mechanics without causing performance bottlenecks. Hardware limits introduce one operational caveat for legacy personal computers. Systems older than ten years may encounter launch difficulties, prompting Ludeon Studios to collect hardware diagnostics via the official technical Discord server.
Ludeon Studios Confirms a Secret Project Built on Waylith
Ludeon Studios concluded the engine announcement with confirmation that a second standalone project is currently in active production. The studio verified that this unannounced game utilizes the proprietary Waylith Engine.
The developer shared the milestone via the Steam Community hub, marking the first new title from the team since RimWorld entered Early Access in 2013. The team expanded their internal personnel over recent years to support parallel development tracks.
Specific release windows and genre details remain unannounced while engineers prioritize base tech stability. Management stated that public reveals will follow once the underlying technology reaches complete commercial maturity.
How Can Players Access the RimWorld 1.7 Beta on Steam?
Players can access the RimWorld 1.7 beta by opening their Steam Library, right-clicking RimWorld, selecting Properties, navigating to the Betas tab, and selecting the “unstable” branch.
Steam will automatically download the branch, allowing users to launch version 1.7 without altering the stable 1.6 build on the main branch. Users who do not see the update trigger immediately should restart the Steam client.
Ludeon Studios encourages beta participants to submit technical bug reports through official developer channels. Public testing continues on the unstable branch while developers refine engine balance and mod compatibility. The primary release branch remains on version 1.6 until Update 1.7 completes final validation.
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A video game enthusiast ever since I first got my hands on a Game Boy. Over the years, I've played many different games across various genres, discovering hidden gems and niche titles along the way. I'm also passionate about technology, always up-to-date with the latest news and insight in the PC and Console market. Ready to share and bring you the latest news !
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