Actually, I would STRONGLY vote against increasing the rate at which impacts are drawn. Doing so will just make for a solid, undefined orange glob as the impact anis stack up on top of each other.
Trust me on this, I speak from experience. When making the SubspaceRift Sathanas mod, I had to create a custom version of the warpmap ani (which is used as the impact explosion of the SubspaceRift weapons) because the original version was longer than the time between applications of the impact explosion. The result of using the originals was a white blob, but by speeding up the framerate of the ani so that it was done in one fifth of a second (i.e. so that one cycle of the ani was done just in time for the next to start), it looked right. Increasing the rate of explosion ani application will do exactly the same thing to the impact ani that my using the original warpmap ani did, and it will not look pretty. It would also break those SubspaceRift weapons, which are being used both by my campaign and by others, too.