Hi I noticed my new mac mini (6,2/Quad Core/4gb/SSD) beginning to seriously slow down for the first time yesterday. I was editing a photo in Lightroom 4 with about seven local selection masks and the mini became nearly unusable. At one point the activity monitor showed Lightroom CPU use at 400%+ (and RAM 2GB+). Is this normal? Is there anything I can do (other than use less masks/buy a mac pro etc!)? Thanks in advance!