cg_brassTime

The cg_brassTime determines how long the “brass” or “cartridges” are visible on the ground when using weapons such as Machinegun or Shotgun.

Usage:
/seta cg_brassTime 0
then do:
/vid_restart

Values: between “0” (off) and “3000” (cartridges are visible long time after the shot)
Default: “2500”

Note:
Setting cg_brassTime off helps (increases) your FPS (Frames per Second), so you will be able to see the movement smother.