Answer please... So:

1: Why the BIG meshes (even not so big 20- 30 meters) render so bad? (disapear, etc) In world editor everything ok, but if you check level (play in editor itself, or in game) starting problems... It's can be fixed somhow?

2: In my videocard (nvidia gtx 260) games or tutorials, n mesh editor, works just fine, but when i start world editor, it hardly warming my card, even in simple render, even on clean map. Why is that happening? I asked once, but nobody answered...

1. you need to set Embed into terrain for big meshes (its in the docs)

2. you can enable screen Synchronization, it will limit fps to 60

A! Thank you, master!