P: Limited Panning Frame rate

[EdgarasG]

Since I experienced a quick reaction and an actual fix deployed via these forums, I'll try one more.

I am observing that Lightroom panning is limited to a fixed framerate (potentially 60hz?), thus not utilizing high refresh rate monitors, in my case 120hz. This also causes significant issues when using G-Sync/FreeSync/VRR, causing stutters, cursor stutters, flickering, etc. This is due to the monitor trying to match the lower panning framerate that Lightroom has and constantly bouncing back to 120hz in my case.

I believe this works correctly and full 120hz is utilized in Lightroom Classic, but not in Lightroom CC. I'd appreciate a comment whether this can easily be fixed. I suspect someone has been hardcoding things 🙂

[Julie Kmoch]

Can you be more specific about where you notice this? You mention panning... is it specifically a problem when you zoom into a photo and drag the image to focus on another area? Or is it broader than that? We're not hardcoding to a framerate, but something might be getting in the way.

[EdgarasG]

Yes, exactly that, when zooming into a photo and dragging the image around. It is visible that dragging occurs at a lower framerate than my 120hz display refresh rate, which also causes G-Sync to kick in and start limiting the refresh rate in order to match the application framerate, causing mouse cursor stutters due to refresh rate reduction and similar issues.

Unfortunately I won't be able to provide more feedback about this, since I moved on to exclusively working on macOS.

[Julie Kmoch]

Thanks, I've filed a bug & will have engineers take a look.

[EdgarasG]

Well, seems like I will still need to use Windows from time to time 🙂

I'll add some more information regarding the visual smoothness issues on Windows. Compared to the macOS version, all panel and UI animations seem stuttery in Windows, while everything is butter smooth on macOS.

I really wish the Windows version of Lightroom Cc would reach the same quality level that the macOS version is. Including a proper dark mode File menu.