Windows:
http://www.adobe.com/support/downloads/detail.jsp?ftpID=2552
Mac:
http://www.adobe.com/support/downloads/detail.jsp?ftpID=2551
from the website:
The Adjusted Refresh plug-in addresses
the time it takes to visually preview some filter updates in Adobe�
Photoshop� CS. This plug-in reduces the size of the Photoshop
image tiles. This causes the display to redraw in smaller
pieces, reducing the time it takes to see the updated preview.
The Adjusted Refresh plug-in will also reduce the initial scratch disk
usage after you launch Photoshop. Note that overall performance
may be reduced for users with multiple processors or more than 1
gigabyte of RAM.
