Terminal Svcs - Slow printing from COM port

Hello,
We have recently installed Windows Server 2003 Terminal
Server and have about 20 Windows 98 clients connecting to
it using Remote Desktop Connection. Everything works fine
except for the local receipt printers -- there is a
signifigant delay between lines being printed. The
printers are connected via COM ports on the local PC, and
the RDC connection is setup to pass COM port traffic.

Any ideas?
Thanks to all.