Also, use LOD - the more distant trees can have less polygons, can be turned into billboards (sprites), etc - since they are so far away you won´t see them detailed anyway. Just make an "EntityVisible" to see if the tree is on screen, then an "EntityDistance" and swap the meshes accordinly to how far they are from the camera.
Also, dont do that every loop, just once every xxx millisecs, or otherwise it may slow down even more your game, instead of speeding it up.
Also, dont do that every loop, just once every xxx millisecs, or otherwise it may slow down even more your game, instead of speeding it up.