Two Identical Users with very different speed results

I have a NS ticket for an excessive wait on creating a credit memo.  They asked that I send in performance statistics and I ended up with something similar to this:

Server       13 seconds, 6%
Network     2 seconds, 1%
Client         186 seconds, 93%

They then indicated it was my problem with browser, hardware, etc.  I am an administrator for my company along with another administrator.  The other admin logged into NS on my machine, my browser (IE) and got the following results:

Server       6 seconds, 82%
Network     .2 seconds, 3%
Client         1 second, 15%

We then went to her machine, her browser (chrome) and had similar results.  Has anyone had similar disparities with users with the same roles and using the same hardware?  150x the delay on the client side on one user vs. the user seems bizarre.