Is mouse_ent works everytime, as mouse_mode > 1 ?
If i want to make my own selection function (i need to ignore sprites, but mouse_ent doesnt allow me to do this), would mouse_ent still take some processor time?

As i think, there is works DirectX function with mouse_ent, so it may slow a bit

Or i can set mouse_range=0; and mouse_ent would be disable?

mouse_mode > 1 does take some CPU resources. The more entities are within the mouse_range, the more processor time is used. Whether or not you use mouse_ent has no influence on CPU resources.

Got it, thanks.