Hi - we have 3 or 4 excel files that are on the larger side (about 10mb each) that contain formulas, macros, and some pictures, that use a crazy amount of memory and processor when they're open, and being modified. The files reside on a terminal services server with 5 Xeon processors, and 40gb of RAM. There are 25 people in the company, and when everyone is logged on, and one person opens and makes changes to these files, the performance drops quite a bit, and everyone feels it. In what I've seen, when its being modified, it could be using the equivalent to 1 processor, and about 1.5gb of memory. Any Excel Pros have any suggestions or ideas on why this could be happening, and what to do to minimize the impact? Your help is much appreciated.