Lightroom 8.1: Super slow with large images from Nikon D850 on super fast iMac

  • 1
  • Problem
  • Updated 4 months ago
  • (Edited)
Hi guys


I have this iMac below


Screen Shot 2019-01-15 at 40004 PMpng


and the latest Lightroom and when I use the adjustment brush to select areas for the adjustment it goes super slow. 

What is going on with, is Adobe going to fix this issue, please?

I have the fastest iMac you can buy and with all the upgrades as you can see. 

Can someone help me please as this is slowing down my workflow massively?


Do I have to learn another editing software as this one won't work with large images?


Photo of Justin P Thomason

Justin P Thomason

  • 1 Post
  • 0 Reply Likes
  • frustrated

Posted 4 months ago

  • 1
Photo of Rikk Flohr

Rikk Flohr, Official Rep

  • 5362 Posts
  • 1115 Reply Likes
Try going to Preferences>Performance and unchecking the GPU option. Does your brush speed up?