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Message: <blockquote data-quote="BackdoorArts" data-source="post: 350009" data-attributes="member: 9240"><p>There are cache and memory usage settings in the Photoshop and Lightroom preferences that can grab and hold resources that your computer would otherwise use.  History settings can also chew up a bunch of resources if you're not careful.  I've got 16GB of RAM and I need to close out and restart Photoshop after a dozen edits or so as it seems to hold onto stuff even after I close out the images.  I personally haven't done enough legwork to set mine up to be its most efficient, so I can't give you recommendations, but I'm sure if you hit an Adobe forum or google for optimized Photoshop memory usage settings you'll find something to help.</p></blockquote><p></p>