We've been experiencing a weird issue when loading a bunch of USD assets onto a scene that contain a usd preview surface material set to preview purpose, where the viewport is constantly drawing and seems to be hung up on the USD Stage Material setup. It's been difficult to pinpoint what triggers this, at the moment it's random and sometimes switching desktops or labs resetting the viewport fixes the problem, on other times we just have to close the scene.

This gets really problematic when we have a scene with 100+ assets, turning textures off on viewport doesn't help. The only other solution is to drop a unassign material LOP node. Once this issue happens even if I try to reference in a single asset the same thing happens, So I don't think its anything specific to having an assembly of usd assets.

Could this have anything to do with the assets having textures on a network drive? Unfortunately can't share a scene because of local studio assets but can attach a screenshot of the way all of the assets are structured.

If anyone else has experienced this I would love to hear your input!