I think I've stumbled upon a problem with Excel that seems to get worse, depending on how many user controls happen to reside within the workbook. I have experienced this now on two separate PCs - esp. with one particular file that was on both PCs that happens to be chock-full of macros and user controls.
Basically, it takes an excrutiatingly long time to open and it's terribly frustrating trying to do your job around this! Now, there are macros that run on startup, but for the longest time up until recently, this file didn't take long to load at all. It may have happened somewhat progressively, but it seemed to all of a sudden completely go into slow motion and restarting the computer does nothing to deter this now consistent issue! Please ... let there be someone out there who can help to shed some light my way?