What is your connection set at?

IF you say that you have a T1 connection it will use more bandwidth. If you have a T1 connection and you want it to only use a portion of it then set your connection speed down a bit. Something like DSL or Modem. Now keep in mind that you will lose some performace in doing this.
If you have aleady done that and still it doesn't work. Try using TOP or some other form of process/memory viewer to see what your resources are doing.