I have a program written in Vee 7.0 which is intended to take S11 data from an Agilent 8753ES as quickly as possible using an "On Cycle" loop. I am taking data at 1.1Ghz, 1.4Ghz, and 1.7Ghz. Number of points = 3. The problem I am having is this. I have two laptops, an IBM Thinkpad and a Dell 8100. Both running Windows XP, Vee 7.0. When I run the same program on the Dell using first an Agilent 82357A USP to GPIB interface I am able to take these 3 measurements in about 1.24 seconds, using an National Instruments PCMCIA card on the same machine using the same program, it takes .200 seconds to make this measurement. When doing the same thing on the IBM using the 82357A interface the time is 1.20 seconds and using a NI PCMCIA card the time is .210 seconds. So I don' think the computer is the problem, but for some reason using the 82357A interface takes about 5 times longer that the NI PCMCIA. Has anyone experienced this problem before?