When I open Photos, it causes a massive slow down on my hackintosh. It doesn't crash the system but it crawls along. If I close Photos it does not resolve.....only way to fix it is a shutdown and reboot. I'm running 10.13.5 and had the same issue on 10.13.4. Running ASUS Maximus Hero X (non-wifi) i7-8700k Sapphire RX580 16GB Trident RAM 4K LG Display Other than Photos, my system works flawlessly.