We'll need a little bit more information than that, please can you provide more information about your Mac. Instructions on how to do so here - http://answers.ea.com/t5/The-Sims-Mac/READ-FIRST-Sims-4-Mac-Help-Guides-and-Troubleshooting/m-p/4612396/highlight/true#M162
I have OS X El Captian
Version 10.11.1
MacBook Pro (15-inch, 2.53GHz, Mid 2009)
Processor: 2.53 GHz Intel Core 2 Duo
Memory: 4 GB 1067 MHz DDR3
Graphics: NVIDIA GeForce 9400M 256 MB
NVIDIA GeForce 9400M:
Chipset Model: NVIDIA GeForce 9400M
Type: GPU
Bus: PCI
VRAM (Total): 256 MB
Vendor: NVIDIA (0x10de)
Device ID: 0x0863
Revision ID: 0x00b1
ROM Revision: 3448
Displays:
Color LCD:
Display Type: LCD
Resolution: 1440 x 900
Pixel Depth: 32-Bit Color (ARGB8888)
Main Display: Yes
Mirror: Off
Online: Yes
Built-In: Yes
Yes, I did do the repair the game, it stayed the same.
Thanks.
Your MBP is right at the bottom of the minimum requirements to run the game so it's most probably struggling if you've added additional packs to your game and/or CC/Mods. Try lowering your graphics settings to low, enabling laptop mode and making sure nothing else is running on your Mac.
You're also running an outdated version of El Capitan, update it to 10.11.6.
