In addtion to AdamT's suggestion: Have you tried copying the excel sheet to the local Citrix drive? Let the user try to do the calculations when the sheet is on the local drive of the citrix server. If you see dramatic improvements then you might want to shift your attention towards the fileserver.. Regards Aleks -----Oorspronkelijk bericht----- Van: thin-bounce@xxxxxxxxxxxxx [mailto:thin-bounce@xxxxxxxxxxxxx] Namens Adam Thompson Verzonden: vrijdag 25 november 2011 13:30 Aan: thin@xxxxxxxxxxxxx Onderwerp: [THIN] Re: Excel performance Issue Dragging this slightly off the topic of Citrix: I'm wondering if the performance issue is on the file server? I'm not sure if Excel ordinarily uses memory-mapped files, but I think that the Windows file cache will redirect I/O requests to a virtual memory-mapped structure. If your file server is also x86, it might be the source of your slow performance. To start with, I'd set up perf counter logging on both the Citrix servers and the file server, looking for mem usage, paging, network and disk I/O bottlenecks. -- AdamT ************************************************ For Archives, RSS, to Unsubscribe, Subscribe or set Digest or Vacation mode use the below link: //www.freelists.org/list/thin ************************************************