Hi Lee. Thanks a lot for your attention. I think I have isolated the problem, see this thread:
http://www.blitzbasic.com/Community/posts.php?topic=54572
There are some double tris, in a 20k Triangles Mesh about 3500 where clones, unneeded Tris with some diffrent textures. When you render this (bysides the general slowdown of the known "identical tris problem" for Graphic Cards), its only karma if you see Tris 1 or 2... It has probably also something to do with the way, surfaces are not loaded in the same order every time. I'll also post my test code in the linked thread.
http://www.blitzbasic.com/Community/posts.php?topic=54572
There are some double tris, in a 20k Triangles Mesh about 3500 where clones, unneeded Tris with some diffrent textures. When you render this (bysides the general slowdown of the known "identical tris problem" for Graphic Cards), its only karma if you see Tris 1 or 2... It has probably also something to do with the way, surfaces are not loaded in the same order every time. I'll also post my test code in the linked thread.