The performance differences cannot possibly be explained by hardware differences, at least not of normally functioning hardware. The iMac’s 1TB HDD is less than half full. This is the first time I've ever seen this alert, and of course it hasn't appeared on my other similarly configured machines. However, later today CleanMyMac running in the background during normal use alerted me that the system was nearly out of RAM. I ran CleanMyMac, with no apparent benefit. Even About This Mac takes a good 5 sec to appear.Īctivity Monitor doesn’t show anything markedly different from the other machines, and no big memory pressure except for going into yellow a couple of times during the PS image resizing. Large windows with many folders/files are slow to populate when opened, and folders with dozens of image files take several minutes for all their generic icons to be replaced with thumbnails. None is running a background process like BOINC. The apps on each machine are largely the same, including CleanMyMac. All these normal figures are more or less duplicated on my late 2014 27” 5K iMac with 3.5 GHz quad-core i5 processor. A cold start takes a couple of minutes from chime to login on the iMac, 10 sec on the MacBook. In PS CC, it needs FIVE MINUTES to rescale a 36 MPx image file to twice the pixel dimensions my late 2012 13” MacBook Pro Retina, with the same specs but an SSD and an i7 dual-core processor with smaller L2 cache, accomplishes the same task on the same file in TWO SECONDS. It takes the better part of a minute to launch Mail or Photoshop CC. My late 2013 21.5” iMac with a 2.9 GHz quad-core i5 processor runs excruciatingly slowly.
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