We open very large excel documents over the network that take between 7 - 10 minutes to calculate formulas or save the document on average. I wouldnt think that updating the formulas would have anything to due with the network since its working in a temp file; however, I could be wrong. When the document opens with automatic calculation the document takes a while to load, if it has manual calculation opens right away. The desktop we're opening them on runs Windows 7 Professional with 8GB of memory with an Intel Core 2 duo E8500 3.17 GHz processor. The network is a 1Gb connection at the serve and a 100Mbps connection on the client so I'm assuming there is a small switch somewhere between. Our first solution was to run the doucments straight off the server; however, it seems to run slower. The server only has 2GB of memory and has a Intel Xeon E5310 1.60 GHz processor. The spreadsheets are about 20MB in size. We need to get these sheets running faster as they run our business. Any ideas would be greatly appreciated.