Hello. Battlefield game has big lag after adding this model to level. I think its because of collision.
colision 1, 2 made more simple then main model, many faces, poligons deleted.
your COL01 is spot on, but your COL02 could be MUCH simpler. A rule I live by, no matter how many polys my LOD01 is...100 or less polys for COL01, 500 or less for COL02. Sometimes I go over this, but i's a rare thing. You are only trying to define a part of the mesh that will come into contact with other physical objects in the game (players, projectiles, etc). It does NOT have to be super defined.
Also, make sure to unhide any hidden geoms and delete them, you may have some geoms that are being exported that don't belong in the scene?