In my experience, and after extensive profiling, Unity 6 Physics is noticeably slower compared to version 2022.3.5X. It’s surprising that this issue hasn’t been widely discussed.
In our case, after spending over a month upgrading everything in our late-production game to take advantage of the new features, we discovered this performance drop, which was quite disappointing. Is this something known? Is there any reason for it (New version of the Physics engine)?
I just upgraded from 2023 to Unity 6 and got 20 FPS (was 120 FPS). After fixing the timestep (which broke without warning) and after closing some additional windows in the Unity UI I got 60 FPS. Which is still twice as slow.
Some people are reporting FPS drop when they hover over the Unity UI. I can confirm this.
I suspect Unity is deleting threads about it? The drop is obvious but mentions of it are only a few days old.
Yes, I can confirm the UI perfomance regression as well. For now, we’ll stick with Unity 2022.3, as upgrading to Unity 6 is definitely not worth it at this point.