Hello folks! I have the MacBook Pro (Retina, 15-inch, Late 2013) 2.3 GHz Intel Core i7 with Nvidia GeForce 750M and 16GB of RAM. My laptop has had great performance so far. However, since upgrading to High Sierra I have been experiencing terrible performance when using the Photos.app. In particular, when I try to edit a photo (most of my files are NEF, Nikon's RAW): - I get graffical glitches here and there, eg when cropping the image might get totally blank and I need to restart the app to get it back or when playing with the adjustment bars they start to flicker. - Every single adjustment takes a few seconds to get processed, whereas previously this was done right away. - When clicking the compare button it takes a few seconds to see the original. - After doing some editing, the app almost always quits and I lose any progress made. - Generally, for some reason the app has started to feel very heavy. I cannot believe the processing power required by this app is so massive that brings my laptop to its knees, but I might as well as believe it in the end. When using Iris Pro I do not seem to have any problems and the UI feels quite smooth and almost similar, if not better, to Sierra. Could this be a problem related to discrete graffics? Any other users experiencing the same issue, perhaps with RAW files? Any possible solution? Nvidia has recently released new drivers ( http://www.nvidia.com/download/driverResults.aspx/125379/en-us ) and apparently some users have seen improved performance. Having not tried this before, how safe installing these drivers would be? Anyone tried? Any help with my queries would be much appreciated!