3 machines, same application, different speed results

I have an app on three different machines; front end on the PC, backend 
on the network.

These are my results on loading the application when I press OK from the 
Logon form (username/pw) to presenting the opening form and fini****ng 
running setup routines.

On the old machine (4 yrs old). Win2000.  Dell.  1 gig memory
	A97 (backend A97 format) 7-8 seconds
	A2003 (backend A97 format) 12-14 seconds
	A2003 (backend A2003 format) 8-9 seconds

2 new machines.  XP.  2 gigs ram.  Dell.
	A2003 (backend A97 format)  25 seconds to load on each.

A2003 is service pack 2.  All computers use the same desktop icon.

Both new machines are extremely slow on opening and going into various 
forms.  They're on the same network, same  backend file as the old 
machine.  They use Norton AntiVirus.

The backend resides on a Novell file server.

Any ideas on what could cause the new computer load time to almost 
double in time compared to the old machine?  I would think a faster 
processor and more memory would make them faster.