Might I ask what it is you are doing? You might want to examine the command to see if there's a way to spead it up.

Also, remember that I/O to a device (in this case, a file on a drive) is often the slowest part of a system. I believe that writing to /dev/null rather than an actual file can speed things up if you don't need to store the output. At least, I think it does, or at least did once upon a time. If you can redirect to /dev/null instead, that might help.