Well those old Pentium 70 laptops were kind'a slow all the way around, whereas these new desktops would fly if they had wings.
Can you describe the characteristics of the various machines?
Have you checked the properties of the NIC devices for transfer mode/speed?
Is QoS service running? (In NIC properties)
To say one machine is faster than another is definitely asking the blind to lead the blind.
Its not that old of a laptop.
1 GB of RAM, 2.0 Ghz Centrino Processor, On XP PRO.
And yes i have checked all the NIC Properties.