I have found what is probably a bug in Vista and/or Windows 7: when copying EFS-encrypted files to a different computer without EFS performance is severely degraded. This is caused by 30 second timeouts during which the copy target looks for non-existent domain controllers. I have described the issue and a workaround in detail here: http://blogs.sepago.de/helge/2009/12/16/the-30-second-file-copy-bug-or-efs-bad-performance/ ---- Please visit my blog at http://blogs.sepago.de/helge