Improved performance of Windows Internet Explorer 7 in Windows Vista, reducing CPU utilization and speeding JavaScript parsing.Improves the performance of domain-joined PCs when operating off the domain in the current release version of Windows Vista, users would experience long delays when opening the File dialg box.Improves the time to become active from Hibernate and Resume modes.Improves the speed of adding and extracting files to and from a compressed (zipped) folder.50% faster when copying files from a remote SP1 system to a local SP1 system.45% faster when copying files from a remote non-Windows Vista system to a SP1 system.25% faster when copying files locally on the same disk on the same machine.