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Upgrade the memory of your 2019 iMac up to 128GB
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HDMI, SD card reader,
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See also OWC 14-port Thunderbolt 3 Dock"

How to Disable CPU cores

Last updated 2013-12-15 - Send Feedback
Related: CPU cores, how-to

It is possibl for programs to perform faster with fewer CPU cores (even at the same clock speed)—see More CPU Cores Can Be Slower. Fortunately this appears to no longer apply to Photoshop CS6 as of late 2013.

Disabling some CPU cores

Toggle the image to see that Hardware Multi-Threading (virtual cores) when unchecked results in Active Processor Cores of 4 (instead of eight).

How to disable physical and virtual CPU cores in Apple XCode Instruments

Where is Instruments?

Instruments is part of Apple XCode, though it is buried inside the XCode application and not self evident in the Applications or Utilities folder.

The easiest way to get to it is to search for it with Spotlight (cmd-space), then show it in the Finder (Show All in Finder). Then drag it to the Dock, which makes an alias to it.

Finding Apple XCode Instruments

 

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Works on any Mac with Thunderbolt 3

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