If someone were telling me this, I would never believe him/her...but trust me when I say I saw this with my own eyes.

One of our clients is running a big VFP app over Citrix. The app allows a client to specify file locations in a PROJECTS.DBF. The client was using UNCs to define folder locations.

We had TERRIBLE performance when more than one user logged in. To strip this down to bare essentials, we found that doing the following exposed some strange performance issues:

With one task running:
cPath = '\\server\whatever\whatever\folder'
use (cPath + '\Invoice')
* do some basic queryies

that might take 10 seconds to run


BUT...have two different Citrix sessions run the same program, and it would take 5-10 MINUTES to run!!!

When we did NOTHING but switch to drive letters instead of UNCs, that made performance acceptable.

It's hard to believe that multiple authentications of UNCs across a LAN could make that much of a difference, but it did.

Any thoughts/clues? This is arguably one of the most bizarre things I've ever seen.

Thanks,
Kevin