Image: PC GamerTL;DR
Ludeon Studios replaced Unity with its own engine to improve performance. Save games and most mods remain compatible.
Update 1.7 moves RimWorld from Unity to the Waylith Engine. Ludeon Studios claims performance is 2 to 4 times better. One late game colony test showed 2.2x better performance. Load times for a 1,500 modpack dropped from 14 minutes to 6 minutes. Some Reddit users report stable 120 fps, though others say the build uses 12 to 13 GB of RAM at startup. Ludeon also mentioned the Waylith Engine is being used for a new, unannounced project. PC Gamer has the full details.
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