Excel super slow on paste function in 2007
 

When you copy and paste one cell to another I get the circular waiting bar
and after 4-5 seconds it pastes. If I'm doing a bunch of cells, it still
takes 4-5 seconds per cell and the cells will appear right to left, 1 every
4-5 seconds until it's complete.

If I hit ESC, everything copies and pastes right away.

This started happening when we converted a 2003 file to 2007. It affects
everyone so it's not my PC, it's the document. There are no active add-ons
but I recently downloaded an add-in that I got from this discussion board to
find hidden links (it's disabled now).

What could cause this?