Adobe has released their “Adjusted Refresh plug-in” in order to help increase the preview performance of Adobe Photoshop CS explaining that, “the Adjusted Refresh plug-in addresses the time it takes to visually preview some filter updates in 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 1GB of RAM.”
More info and download link here.