>We are having terrible performance with one of our instances of TSM. ...

Andy - We'd like to help, but would need a lot more information about the
       context of the issue, and in particular what you've already
investigated.

I'd refer you first to the TSM Performance Tuning Guide at
 http://publib.boulder.ibm.com/tividd/td/IBMStorageManagerMessages5.2.2.html
I also have performance issue summaries in ADSM QuickFacts, compiled from
our community experiences over the years.

  Richard Sims, BU