If you mean in cs:go anisotropic filter 0 x4 x8 x16 is the same, doesn't help.
For some weird reason the cross hair becomes smaller at 1280x720 stream, at 1920x1080 it has the same size but is colors are fading out during movement like it's doing right now on 1280x720 it loses color consistency while moving not only the cross hair but other things to.