application execution speed on different computers

[ErikC]

I have built an executable application of a VI. When running it on another computer it doesn't run at the right speed. It runs at about 1/3 of the intended speed.

The hardware is the same, DAQPAD-6015 (USB interface). The computer that runs it slower is a laptop with more memory and faster procesor than on the stationary one that runs the program faster. I can see in the task manager that it runs on about 5% CPU usage and it has alot of free memory. 

The while-loop in the program is using the Wait Until Next ms Multiple function to execute every 20ms.

Any ideas what the problem is? USB related?

[LV_Pro]

How do the graphical cards for each computer compare? How are the preferences for the graphics set up. It might also help to have an idea of what/how the application works, i.e., transfering large amounts of data, processing large amounts, lots of graphics, etc. This can affect the speed in a couple of ways. Obvious if there is a large amount of graphics, or some graphical elements overlap, the graphics card can make a big difference. If you are dealing with larger data sets your virtual memory settings may be important, etc.

P.M.

[Ben]

I second LV-Pro's comments re: graphics.

Also not all USB ports are created equal. This applies to USB as well. The old ones are good but slower than the new.

Ben

[Ben]

see Chris rake's presentation here for info on USB versions.

ftp://ftp.ni.com/evaluation/niweek/proceedingscd/hot_technologies/an_in-depth_look_at_usb_20.pdf

Ben