11 Replies Latest reply on May 20, 2018 10:36 AM by johnrellis

    LR6 OSX Adjustment brush slow lag

    KE_DP Level 1

      I'm experiencing long delays while trying to paint with the adjustment brush.  Even toggling the on/off brush adjustments pane is a bit slow to react.

       

      I turned off the prefs/performance/graphics processor which helped maybe only incrementally.

       

      5K iMac 3.3 GHz 32GB Ram

        • 1. Re: LR6 OSX Adjustment brush slow lag
          johnrellis Most Valuable Participant

          Which exact version of Macos?

          • 2. Re: LR6 OSX Adjustment brush slow lag
            dj_paige Level 10

            Brushing causing slowness is a known problem in Lightroom, made worse on a 5K screen. Turning off the GPU should help some, but the problem is that your CPU doesn't have the power to re-render the image and re-draw the screen in any reasonable amount of time.

             

            Some things you can try:

            • Do the brushing in Photoshop or Photoshop Elements
            • Do the brushing as the next-to-last editing step in Lightroom, and the last step would be to apply transforms and lens corrections if desired
            • Get a much faster CPU
            • 3. Re: LR6 OSX Adjustment brush slow lag
              KE_DP Level 1

              OSX = 10.11.6 El Capitan

              • 4. Re: LR6 OSX Adjustment brush slow lag
                johnrellis Most Valuable Participant

                OSX = 10.11.6 El Capitan

                LR pushes the limits on using the GPU, triggering bugs and performance issues in older GPU drivers.  Updating the graphics driver often solves display and performance issues.  Your version of Macos is relatively old, so it's entirely possible that updating the graphics driver will improve your performance.

                 

                Unfortunately, the only way to update the graphics driver on Macos is to update Macos itself (i.e. to 10.13.4). 

                • 5. Re: LR6 OSX Adjustment brush slow lag
                  KE_DP Level 1

                  johnrellis  wrote

                   

                  OSX = 10.11.6 El Capitan

                  LR pushes the limits on using the GPU, triggering bugs and performance issues in older GPU drivers.  Updating the graphics driver often solves display and performance issues.  Your version of Macos is relatively old, so it's entirely possible that updating the graphics driver will improve your performance.

                   

                  Unfortunately, the only way to update the graphics driver on Macos is to update Macos itself (i.e. to 10.13.4). 

                  Thanks - I've been delaying updating due to potential software incompatibility, but it might be time to re-evaluate that position - at least for this machine and maybe keep an older OS on a bootable drive or 2nd machine for running the legacy programs.

                  • 6. Re: LR6 OSX Adjustment brush slow lag
                    dj_paige Level 10

                    johnrellis  wrote

                     

                    OSX = 10.11.6 El Capitan

                    LR pushes the limits on using the GPU, triggering bugs and performance issues in older GPU drivers.  Updating the graphics driver often solves display and performance issues.  Your version of Macos is relatively old, so it's entirely possible that updating the graphics driver will improve your performance.

                     

                    Unfortunately, the only way to update the graphics driver on Macos is to update Macos itself (i.e. to 10.13.4). 

                    There's just one problem with this. It is a true statement, that graphics drivers need to be updated — but graphics drivers are not the cause of this brush lag. The cause of brush lag is inherent in the design of Lightroom's non-destructive editing algorithms, and was present long before GPU acceleration was used in Lightroom.

                    1 person found this helpful
                    • 7. Re: LR6 OSX Adjustment brush slow lag
                      KE_DP Level 1

                      dj_paige  wrote

                       

                      There's just one problem with this. It is a true statement, that graphics drivers need to be updated — but graphics drivers are not the cause of this brush lag. The cause of brush lag is inherent in the design of Lightroom's non-destructive editing algorithms, and was present long before GPU acceleration was used in Lightroom.

                       

                      Thanks for the insight - sounds like something we'll have to live with for now.  It does make me wonder if the behavior is the same in ACR?

                      • 8. Re: LR6 OSX Adjustment brush slow lag
                        dj_paige Level 10

                        ACR uses the same algorithms as Lightroom, so yes the same problem will appear. As I said, Photoshop and Photoshop Elements will handle brushing much faster.

                        • 9. Re: LR6 OSX Adjustment brush slow lag
                          johnrellis Most Valuable Participant
                          The cause of brush lag is inherent in the design of Lightroom's non-destructive editing algorithms, and was present long before GPU acceleration was used in Lightroom.

                          Very much agreed. But others have reported that enabling a properly performing GPU lessens the brush lag.

                          • 10. Re: LR6 OSX Adjustment brush slow lag
                            dj_paige Level 10

                            johnrellis  wrote

                             

                            The cause of brush lag is inherent in the design of Lightroom's non-destructive editing algorithms, and was present long before GPU acceleration was used in Lightroom.

                            Very much agreed. But others have reported that enabling a properly performing GPU lessens the brush lag.

                            Then I'm surprised because enabling the GPU acceleration is supposed to slow down brush performance

                            • 11. Re: LR6 OSX Adjustment brush slow lag
                              johnrellis Most Valuable Participant

                              Perhaps there's a difference in reports between those with very old GPU drivers that don't perform well on many operations and those with GPU drivers that perform well generally overall.   The former may be the source of reports that the brush lagginess improves with an updated driver.