For Quest users (standalone VR), Sydney is usually the most optimized. Her model is low-poly enough to run smoothly, and her aggressive voice lines ("Let's go! Let's go!") make for great hype energy in game worlds.
Because these models can be complex (high polygon counts and many toggleable sub-meshes), they are often ranked as "Poor" or "Very Poor" VRChat Performance Ranking System vrchat payday 2 avatars