My constraint-based clone system "Dextro's Clone System for VRChat" or "DexClone" (https://dextrovr.gumroad.com/l/DexClone) is encountering issues with conversion to VRC Constraints in the current Open Beta.
-Upon toggling on the constrained "clone" avatar, the VRChat client hitches significantly, and continues to hitch on each toggle off or on again
-One (optional) feature of the system is to record a small animation and play it back on your avatar. In the Beta attempting to use this feature absolutely destroys performance, throwing the clone avatar around and dropping to 2 FPS.
-Another option on the system is to "mirror" your clone by scaling it -1 along the X axis, and copying the local position and rotation to that -1 scaled space. In the Beta this causes all of the clone's limbs to contort and spasm out.
Video of broken behavior in 1482:
Video of correct behavior in Live (1472):
Avatar used to test: avtr_6427893a-ad1a-4106-993c-62621a56ce23
It should be noted that while, yes, this system does use a
lot
of constraints for the recording and playback feature, only about 150 of them are actually enabled on any given frame. Since stock Unity constraints seem to handle it just fine, pegged to 165 FPS on my system, I would not consider VRC constraints more performant at 2 FPS.