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I've just set up a new laptop (a BTO 16-inch MacBook pro with maxed out RAM, GPU, and processor options), and I'm experiencing a very unusual lag while cropping images. I'm using an external monitor as my primary display and the laptop as the secondary one.
The lag is only on the secondary display. My usual approach to cropping an image is to do the cropping on the main display where the grid overlay is visible and then to glance over at the secondary display to see the results. It has always worked out that the changes made on the primary display are imediately visible on the secondary one as soon as I set a new crop. But now the secondary display is always one crop behind whatever I do. So the secondary display is always showing something different than the primary one, always the previous crop adjustment, not the crop as it currently stands.
And for what it's worth, I get the same performance when I reverse the displays and have the external monitor set to be the secondary one.
EDIT: I've just tried it with a much older Mac and am getting the same behavior on the secondary display.
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The secondary display in Develop mode is done from a jpeg preview and not the same way as the primary display. You will always see lag doing this that will take about as long as generating an almost full size preview image because the resolution of the screen is quite high. It can take many seconds to do that update.
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I'm almost certain that it didn't always have this cropping lag, though. All other edits show up immediately, but not cropping edits. With the crop tool, I can wait for minutes and not see the secondary display update, but the second that I make a new crop, it instantly shows me the previous crop (not the current crop).
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It should take 1 or 2 seconds each time normally. If it is longer there is a problem indeed
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It's definitely not normal. If I make a crop, there is no change on the secondary display no matter how long I wait while the crop tool is still active.
This is what happens:
1) I choose the crop tool and move one or more of the handles to crop the photo. There will be no change on the secondary display, no matter how long I wait. Let's call this Crop #1.
2) I move a handle for a different crop. I move one of the crop handles a second time, then the other display instantly updates to the *previous* crop, Crop #1. But now I'm on Crop #2.
3) I move a handle a third time. This is now Crop #3. The secondary display instantly updates to show Crop #2, not this current crop.
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Similar with Windows 10. Secondary display doesnt update until mouse release in primary display. Never saw this before November update. Previously secondary display updated in near real-time with very short lag. Very annoying. I consider this a bug.
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After resetting my preferences completely, the bug is now gone, and the crop tool behaves normally again.
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All of them. Very easy to do: https://helpx.adobe.com/lightroom-classic/help/setting-preferences-lightroom.html
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It would be nice if Adobe could tell us what is wrong in the preference file so it could be edited manually. It's a joke that every time a bug pops up the answer is to reset the preference file and start all over again. I reset my preference file and it fixed the issue on Windows 10, I went back to my old preference file as I don't have time to reconfigure LR all over again. I wish they would fix this in an update, but doubt they will. How about fix the preferences so bugs like this do not pop up all of the time.
Another thread with other users with the same issue: https://feedback.photoshop.com/photoshop_family/topics/refreshing-crop-view-on-secondary-display
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I also have this problem. It started when I updated to 9.2 so I went back to 9.1. It worked for a while. Now it's occurring in 9.1. Very annoying!
Win 10 Pro GTX 1080
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After spending time with level 1 support and not resolving the issue and no desire to reset my preference file YET AGAIN, I narrowed down the offending line in my preference file and I believe I now have it fixed. At least until it breaks again. 🙂
I just gave this information to a level 2 support rep. If they can reproduce it, or if it is a known issue we may see a fix in an upcoming release. This line item was one of many lines that were different in a "clean" preference file in comparison to my "bad" preference file.
I feel Adobe should have a tool to fix preference files instead of asking you to reset all of the time.
I have had this setting as 1 for 7 days and it continues to work. I only have one machine, so I can't verify it works in other places. It may only fix my machine and there may be another issue for you, hopefully this fixes your LR install.
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same problem here. Lightroom Classic 9.3
MacOS Catalina.
Resetting preferences did not help.