Please click on Lightroom at the top left corner, and then click on Preferences.
In the Preferences Window, please go to the File Handling Tab , under the Camera Raw Cache Settings , where it says Maximum Size : 1.0 Gb, please increase it to like 80 Gb.
Also uncheck the option " Use Graphics Processor ".
Restart Lightroom, and then check if the Crop tool works fine or not.
Incase it does not work fine, I would suggest you to please create a new catalog and then try in the new catalog.
Also you may refer to the following document : https://helpx.adobe.com/lightroom/kb/optimize-performance-lightroom.html
I've just spent a good hour with Adobe support who remotely logged into my system and was able to try a bunch of things to solve this, including what Tanui very kindly chipped in with above. Thank you Tanui, unfortunately it didn't solve the issue, because....
Well, to sum it all up, nothing, NOTHING, solves the issue, including uninstall/reinstall, smaller previews, no GPU, no internet, disabling the second display, purche caches, increasing cache files sizes, delete previews, create new catalogs etc.
To all you lost souls out there, this problem lies within the CC 2015 1.1 development module that apparently is not communicating well with the configuration of my late 2013 MacbookPro Retina 15" with 16GB RAM (I mean not that old, right?). The machine has graphic cards NVIDIA GeForce GT 750M 2048 MB and Intel Iris Pro.
The proof is seen when booting the computer in safe-mode and then use LR. No problem found there.
So that leaves me with two options: Either install an older version of LR or wait/hope that this will be solved in a future update of either the LR and/or OS X. Should I be hopeful that the latter is going to happen?
For the record, I have never had an issue with LR before upgrading to CC 2015. Neither do I have any performance issues with any of the other CC 2015 apps. Straaaaange.
Anyone out there experiencing the same, I would be very happy to know.
If the problem goes away when you run the system in Safe Boot, it means that there is another application running in the background which is gobbling up system resources that Lightroom requires in order to run correctly.
Here is information about what is happening with your system when you start in Safe Boot: Try safe mode if your Mac doesn't finish starting up - Apple Support From the list of things going on with Safe Boot, here are the two that most likely apply to the situation at hand:
- Loads only required kernel extensions
- Prevents Startup Items and Login Items from opening automatically
First, disable any applications that are running in the background due to being a Startup Item or a Login Item. Take control of startup and login items | Macworld
I've been suffering similar problems with the crop and levelling tools. Also if I zoom in on my secondary screen, it won't zoom back out. But in fact if I use the trackpad on my MacPro instead of the Wacom mouse I normally use - these issues go away. Will now search out an upgraded Wacom driver.