RJH

Hi James, Thank you for your reply. Turning off Metal compute acceleration indeed helped a bit. Images now open in about 15 seconds (which is still far from fast and not comparable with Photoshop's less than a second). Basic edits (exposure, contrast, clarity, vibrance, etc.) are faster, too, but still not like in Photoshop or Pixelmator or Apple Photo. This tile-by-tile thing (the edit's result shows in one part of the image, then in the next, and so on) is still there, and, for instance, changing the exposure still takes over a second. This doesn't sound like long (and is much better than the 5 seconds I experienced before), but in Photoshop I see the whole image brighten or darken immediately with the slightest move of the dial, so I see the change immediately, which makes editing much easier. Maybe I shouldn't compare Affinity Photo to Photoshop, but even Apple's Photo provides delay-free processing. I'd like to try the beta, but it requires a product key, which I don't have. Again, thanks for your help. RJH

Hi there, thanks for looking into this. The MacBook is not running in safe mode. Screenshot of Preferences > Performance attached.

Hi, I'm using the trial version of Affinity Photo (V 1.6.11) on a MacBook Pro (2017, 2.3 GHz Intel Core i5, 500GB hard drive, 16 GB RAM, Mojave 10.14.1). I use it as it was installed, no changes made to the preferences or elsewhere. The software is extremely slow. Opening Fujifilm RAW files (all about 30 MB) takes over 20 seconds. Any basic edit, such as exposure, contrast, clarity, vibrance, etc., takes at least 5 seconds. The editing result is shown only tile-by-tile in the image. The Mac's spinning wheel basically rotates constantly once any edit is made. Photoshop opens the same files in less than a second, Pixelmator in under 2 secs. Basic edits in both applications are real-time. I was hoping I could replace Photoshop and Pixelmator with Affinity Photo, since it's easier to use than Photoshop and offers some features Pixelmator doesn't have. But the slowness makes it unusable for any editing workflow. Am I doing anything wrong or is that a known issue? Any help is highly appreciated! Thanks, RH