If your server machine is a multi-processor machine, you can use a mechanism called processor affinity for fs.exe. You can experiment with this setting via a popup menu accessible from the Process List on the Task Manager. Right-click fs.exe in the process list, and you can then select a context for the process. If you have the Windows Server resource kit installed, it includes a utility called imagecfg which you can use to permanently set processor affinity for a given .exe file.