Using Office XP with Office 2007.

I have a severe slow down in my code when using any For Each...Next
structure, such as "For Each Cell" or "For x = 1 to 10000"...

This slow down seems to be only in Office 2007. In 2003, my code runs like a
machine gun; in 2007 it's more like a burp, wait a second, burp, wait a
second...etc.

This is the same code on the same machine so I'm sure my code is not to
blame since it has always run fine in 2003. At this pace, a program that used
to run in a few seconds could now take several minutes.

Has anyone got a fix or any ideas how to make it run faster?

Thanks much for your assistance/guidance.