Hi all, there´s a very nice discussion here: https://forums.adobe.com/thread/1822782?start=0&tstart=0 In short, all of you using up to date AMD drivers should try to remove then (using add/remove programs) and install older drivers. The version that is working for most people (me included) is the one released in March, 25, 2014. Version 14.4. You can simply try to downgrade and if that doesn´t work, do a full software/driver uninstall, reboot, install drivers/software version 14.4, reboot and check back at the performance tab inside lightroom.
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