In LR 6.4, any action that I take within the Develop module has become torturingly slow. I was using the adjustment brush and I'd make a stoke and LR would take from a minute to several minutes to have that stroke appear. The little colored beach ball just kept rotating. It took me all day to do one simple image. If I tried to use the hand tool to move to another section of the image, it took a long time to do—even using the Navigator took a long time. When I finally finished, I tried to crop the image and had problems with the crop tool as well.
This problem began today and I've done nothing to the computer except use it for quite a long time.
I had this problem a few versions ago, but it went away when I upgraded to the newer version. When I began to have this problem today, I quit LR and restarted my computer at least twice. Any ideas to help?
I'm on an older Mac Pro (2x2.4 GHz Quad-Core Intel Xeon) running OS X 10.9.5.
Lightroom is version 6.4.
I have 20 GB of RAM.
Graphics: ATI Radeon HD 5770 1024 MB
In the LR Preferences dialog, Performance tab, if the "use GPU" option is turned on, try turning it off.
Thanks, but it doesn't seem to make any difference at all. I made the change to the preferences, then quit LR and restarted it. There's even a delay when going from Develop back to the Library.
I don't have a performance tab in my LR Preferences dialog, is the GPU option found somewhere else?