Also note it can be about 10% faster if you minimize Photoshop while it's running the script. For example on Windows, press
Windows+Dto minimize Photoshop and show the desktop.
As always, you can get the latest script here (version 7+).
Please let us know if you run into any trouble. A lot of the code had to change to make it faster. We've tested it extensively but if you find any issues we'll be happy to fix them right away.