Hello @anonymous_user_527abaec Mink, sorry to hear that; I can confirm that for the models where I had very high texturing times, per-vertex color of the kind you’re reporting was also slow.
Are you making a round trip outside RC before coloring, assigning a UV map in another application?
In my case, I found that this is one of the cases RC doesn’t like.
Also, I found that in corner cases, RC would not generate a valid UV map; texturing would take much longer but the program wouldn’t crash in either UV or texture steps.
I’ve taken to explicitly computing UVs and then evaluating them before coloring or texturing – hope that helps!