With each new version Photoshop has added more and more features. The down side is all those extra features eat up memory and can lead to slow performance, especially on older machines. However, Photoshop doesn’t just make models look pretty, it borrows a little trick from them to keep svelte—purging.
taking command
The Purge command is listed under the Edit menu and allows you the option to purge Undo states, History snapshots, Clipboard contents, or All of the aforementioned at once. Doing this can free up large amounts of RAM and swap file space for you to dedicate
So, next time you overindulge with three-hundred undo states don’t forget to purge once in a while.