Think that tris.´s are the only thing bugging onto performance, if texture resolution is the same and there a lot of unneeded there (and i mean really a lot) ... doe, it depends too, how big the model itself is ... number of "fluent components" isnt any problem, numbers of meshes themselves too (well, maybe if you have 1000 of meshes, than at loading the model into the scene, but that should be it). But still, you should have some of the following up necessities in mind too (thats texturing, functionality and stuff ya can ignore, if bump-mapping can take care of it).