Firstly, what Mac do you have? Please post the following info - http://answers.ea.com/t5/The-Sims-Mac/READ-FIRST-Sims-4-Mac-Help-Guides-and-Troubleshooting/m-p/4612396/highlight/true#M162
Secondly, are you running any CC/Mods? Have you tried running the game without them and did it make a difference?
Thirdly, have you moved your Sims 3 folder from Documents > Electronic Arts out onto your desktop and tried playing? Did it work?
I have a MacBook Pro (Retina, 13-inch Late 2013)
Processor: 2.4 GHz Intel Core i5
Memory: 8 GB 1600 MHz DDR3
Graphics: Intel Iris 1536 MB
I used to have tons of CC/Mods and Sims 3 ran fine with Yosemite, but not with El Capitan. I removed all the CC/Mods and I'm still having the same problem.
Yes, I believe earlier I tried moving the folder to desktop and it did not work.
