What aspects of Lightroom are running slowly?
You can search and find several threads about running Lightroom on a Retina 5K, maybe you will find some advice in one of those threads.
in the library module to move from one picture to the next, the load time is very slow and the export time is excruciating .
in development module applying presets take forever, as well as applying a new crop size
HI this has been well discussed on the Macrumours forums and here too. Seems to be an Adobe thing as other similar software does not do this.
may be down to LR not making use of the GPU or some other reason, I'm trying to make my mind up between buying LR 5 or buying Capture One a pro 8 Which is a fantastic piece of software which does make use of GPU.
i Was hoping LR6 would come out soon (March 2015) but apparently that is just a rumor with no substance.
thanks for letting me know that this has been an issue, everyone! I am new to the Adobe forums, so I am sorry that I did not check first. I ended up resizing the LR window by about 1/4 and it is a little faster now, I also increased the cache to 100MB in the preferences. I still need to find an answer about LR not letting me edit a photo in photoshop, meaning not loading it into PS after I right click on the file and select edit in...Photoshop CC2014