1 2 Previous Next 48 Replies Latest reply on Nov 8, 2018 9:02 AM by cyclopsdx

    Photoshop CC 2018 extremely slow

    mmackinven Level 1

      Hey guys,


      I have a 2017 27" iMac, specs:

      4.2 GHz Intel Core i7

      40 GB 2400 MHz DDR4 RAM

      Radeon Pro 580 8 GB Graphics


      This machine shouldn't break a sweat with Photoshop, however Photoshop is performing the worst I've ever encountered this example is only a 350mb Photoshop file, with about 56 layers (most flattened with a mask) in 20 groups and 5200x3500px.

      • When using a brush or eraser tool, it lags so much that it takes nearly a minute to complete the stroke – then doesn't even follow the stroke I made!

      • Zooming in nearly crashes the file.

      • After about 5 mins of trying, PS just stalls and wont do anything. Open Force Quit Apps and it doesn;t show PS as not responding either.


      I've tried using it with the 'Use Graphics Processor' unticked and it runs even worse!

      30gb of RAM alocated to PS.

      Using default History & Cache

      Scratch disk has 1.2tb spare

      I never use flick panning or scrubby zoom, or any of those kind of features.


      Would this benefit if I got an external SSD to use as a scratch disk?


      What is going on here?

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