you should update your shaders again if you use liltoon or poiyomi
lilxyzw identified some issues with VRCLV2.0 and optimised both liltoon and the vrclv2.0 code
VRCLV2.0 avatars were causing stuttering and lag when people loaded their avatars
and i still recommend holding off on doing the mass reuploading of avatars with the new VRCLV2.0 based shaders to be perfectly honest with you famalam

also PCSS updated so it now supports 2.1.x liltoon shaders and latest poiyomi, it also got some sick upgrades if you use that