Opening menu OR moving, causes legs to freeze/glide in place for 2 seconds.
okaykuro
If you open your menu, then close it and look at your avatars legs, you will notice that they're "gliding" instead of moving normally. This happens in regular VR without full body. I have a HTC Vive. You can also recreate this just by moving briefly. You'll notice your legs will stiffen up and not move. The avatar then will do a "re-loading" effect where it's as if the avatar just finished loading in.
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Yea as far as I'm aware this has to do with the transition between animation and tracked position. It was reported in build 1003 that things got far worse and I'm not sure if anything has been done yet.
Related report that demonstrates the same behaviour for emotes: https://vrchat.canny.io/open-beta/p/1003-emotes-on-sdk3-avatars-behaving-strangely-regarding-head-ik-and-avatar-posi
Edit: Still an issue in build 1010. Definitely looks like some delay with the idle which results in the avatar snapping into its animation/IK position rather than staying still or smoothly transitioning.