Sorry to hear that Lightroom is running slow with RAF files, could you try going to Lightroom's Preferences > Performance and turn off "Use Graphics Processor" option and see if it helps speed up the performance?
Hey - thanks for your reply. Ive tried this and unfortunately it hasnt worked. I really dont know whats going on, its become totally unusable whenever I apply a mask, and changes that I make can take minutes to come through if they do at all, the mask doesnt even dissapear when I make changes so I can't see whats going on, and even toggling through overlays is unreliable, sometimes it'll toggle through the mask overlays, sometimes they will remain, sometimes it'll show some masks and not others.
Todays latest issue is that any changes I apply to the only mask on one particular photo only apply once I have delected the mask functions.
Its unusable - is there a chance that its is running from the cloud version of the image instead of the local one?
my system is good enough for this not to be happening....3.7 6core i5 64gb ram radeon pro 580x 8gb