Hi I have an interesting issue where some Excel power users are complaining about performance on my Windows 2003 XenApp 4.5 farm (x86). We are running Office 2003 and performance is very bad when large XLS files are opened. Its not uncommon for a user to have 2 x Excel + MS Access programs open often using around 800Mb RAM. I did some tests with only 1 user on the server and Excel was very slow. User was using 700MB RAM but no CPU. The XLS file is on the same network as the XenApp server so there are no issues here (Gig networking). Server hardware 2 x Quad Core CPU 10Gb RAM Are there any tweaks I can perform to improve performance for Excel? I have a dedicated XenApp Server specifically for my 5 finance users so there is plenty of resources Thanks Ang