[paegus]

If you increase the sprite duration modifier from -0.05 to say +0.1 you should get sprites that lasts 0.2 seconds instead of 0.05 so the trail will be easier to follow I guess.

g_flSpriteUpdate defines the overall update cycle. if you decrease it, you'll get more sprites rendering and disappearing faster. if you increase it, the sprites will be farther apart and should remain visible that much longer.

Remember though, if you alter g_flSpriteUpdate then you may need to adjust the modifier as well to compensate. But also keep in mind that the more sprites visible, the more work the server, network and clients are doing.