For anyone unaware of the "Splittening":
It's the big performance update that has been in the works for over a year now. Resonite will be split into two processes (Unity and FrooxEngine), which will provide massive runtime performance improvements.
TL;DR: More frames, less lag, smoother game.
That is promising actually. Part of what kept me away from Resonite is that it was somehow getting way worse performance than VRC. Not just FPS but frame drops and stutters.
I'll definitely give it a shot.
Yes you're not the only one. This was Resonite's biggest issue for the longest time, caused by the prior engine architecture. It was never the custom engine itself, just the fact that it was running inside of Unity. The way I heard Froox put it was "The code finally has room to breathe!"
It makes sense to me. I assume much of Resonite's code in this update is running as its own process rather than within Unity's scope. So it works asynchronously from the Unity engine.