Got the latest update for Lightroom CC, performance improvements are great but I get a Lightroom not responding every now and then when launching the import screen - it freezes up randomly and I am forced to go into Activity Monitor and force quit the Lightroom application.
My GPU is turned off under performance - actually it will not come on "due to errors" with the new updated version.
Update - uninstalled Lightroom, reinstalled Lightroom - at first it seemed like the problem was resolved, but no, Lightroom froze up and stayed non-responsive when selecting the import function.
Once it goes unresponsive, the only way out is kill Lightroom and start over. This leaves temporary data and journal files in the Lightroom catalog folder as well as being a royal pain.