Since updating to 10.10.3 my worst nightmare was PHOTOS, it was too slow and I could not import photos from my iphone and my ipad. I hope that Apple understand that they have a big issue with photos and they will have to fix it, also I can't understand why they decided to drop iphoto if it was simply great with more features, faster, easier and better than Photos. They have to think again that photos was not a good idea and keep updating iphotos because it is great. My photo library has more than 200,000 photos and I am sure that they have not check the photos software with that amount of photos that is why they think everything works ok, but when you have a lot of photos you need the best software available like iphoto. Right now I am importing over 1000 photos from my ipad and everything was done in less than 7 minutes, and with photos I could only import over 30 photos and it crashed, and later when I try to transfer photos my ipad did not appear. When you view 200,000 photos everything is slow with Photos, but iPhoto works always great without issues. It is easy to use iphoto in 10.10.3 you have to follow this steps. 1- If you have the updated version of iphoto ( 9.6.1 ) then you can use it with 10.10.3 2- If you don't have the latest version iphoto will not work with 10.10.3 you need to do the following: Open the App Store and go to Purchases see if iphoto is located there, if it is not located there go to your account in the main pages of the App Store and go to your account below Quick Links, there you will find a Hidden Items options, go to manage and click the unhide option of iphoto. Then go to Purchases and search for iphoto, try pressing the update, if it works for you then you are done, if pressing update don't do nothing and iphoto is not updated then go to your Applications Folder and Delete Iphoto. After deleting iPhoto go again to the App Store and then to the Purchases option and search for iPhoto and press the install option. After the iphoto installation is done when you open iphoto you will get a message saying: Which photo library do you want iPhoto to use, press the Choose option because your library will be already selected. Then You will receive a message saying: Your photo library has been migrated to Photo. ( You can open it is iphoto, but any changes such as editing or adding new photos will not appear in the Photos app. Who cares using that ultra bug software, press open iPhoto and your nightmare will have ended.