Excel 2003 - unexpected file size bulking?

Hello.

I've created a spreadsheet with a reasonable amount of VBA, but not
excessive. It's starts off fast and runs without errors, however, users
start to experience dramatic slowdown and unexpected bulking in the
file size completely dissproportionate to the actual information being
manipulated/added. The only clues I have been given is that they have
wrapped text in a few collumns and added some email links. But would
that really cause major issues?

Wondering if anyone has experienced this before?