See the Release Notes: About the OS X El Capitan v10.11.4 Update - Apple Support
Addresses an issue that may cause RAW images to open slowly in Photos
How fast do your RAW images open in Photos after the update? For which cameras?
MacBook Pro (Retina, 15-inch, Mid 2015), OS X El Capitan (10.11.4), 2,8 GHz Intel Core i7, 1TB SSD
Posted on Mar 23, 2016 9:45 PM
Q: Can Someone Confirm This Bug Fix in MacOS X 10.11.4
For DNG files, Canon EOS 5D Mark II RAW files, and Lumix FZ300 files I can no longer see a difference to opening the JPEG of a pair.
