First of all, if you are new to either Macs or Sims 4 and play on a Mac, please read this thread. It's always best to research what problems you can have or others have had and how to avoid them or solve them yourself.
The Wonderful BlueBellFlora has a comprehensive guide to all things Mac for the Sims 4 game. I recommend reading it before posting here. She gives step by step instructions on how to solve most problems that affect those of us who play on the Mac OS. (All computers are PC's which is shorthand for "Personal Computer"). Here is a link to her blog.
https://bluebellflora.com/the-sims-4-mac-help-threads-guides/
This is by no means the only Mac Help Section dedicated to playing on a Mac. Many of us still play Sims 3 and there is a specific Mac Help Section for Sims 3 only. Beware that newer Macs have problems with the playing Sims 3 especially MacBooks. This section is found further down on the Forums page under "Legacy Titles". Here is the direct link for this section.
http://forums.thesims.com/en_US/categories/mac-discussions
And lastly, Origin does not track the hours you've played Sims 4 on a Mac. This is a known issue, will probably never be fixed and does not affect how the game runs or plays. What matters is if you having problems getting the game to run and play properly.
Speaking of Origin, turn off Automatic Updates in the Options section. Why you ask? Whenever the game is patched, Modders and CC makers may have to update their content as EA/Maxis have corrected or changed the way the game plays. These folks will need to update how their mods work or you will get game errors and the game will not start or play properly. Keep note of where you download your mods/CC from and check these sites for updates before you update and patch your game. It will save you hours of headaches later.
Another tip to pass on concerns CC and Mods. Unfortunately there is no "program" that will allow Mac Users to sort through Bad Content. You will have to remove the Mods and CC from your game. So it is best to move your Sims 4 folder to your Desktop (Documents > Electronic Arts > Sims 4). DO NOT DELETE IT! Start up your game to allow a new folder to generate and then add back a few pieces of CC at a time to determine which ones are bad. I color code mine so that I can find the bad CC more easily.
So Mac Simmers, here is your one stop shopping guide to all things Mac, Sims 4 and how to solve the most common problems found. Enjoy!
**Edited to add more information**
Second Star to the Right and Straight on 'til Morning.
Comments
Thankfully Sims 4 really is so much more stable than Sims 3 ever was. Most of the issues that arise are down to iCloud Drive being enabled, CC/Mods causing issues and Origin playing up. After numerous patches, 4 Expansion packs, 6 Game Packs and 14 Stuff Packs, the game is now really starting to lag and slow down on lower spec. Macs and older machines.
One other thing to always do in Origin - turn off Origin in-game. It's been the cause of so many issues in the last few months. EA have also provided Mac users with the most brilliant reset tool for Origin which isn't available for Windows users. Its definitely a link that all Mac users should bookmark - https://help.ea.com/en-gb/help/origin/origin/how-to-reset-origin-on-mac/
Next, have you read any of BlueBellFlora's blog posts? She really details most problems Mac users have and gives step by step instructions to correct it if a solutions is known.
And thirdly, exactly which Sims 4 folder did you delete? The one in the Documents folder or the game folder found in Applications?
2.5GHz dual-core 7th-generation Intel Core i7 processor, Turbo Boost up to 4.0GHz
16GB 2133MHz LPDDR3 memory
512GB SSD storage
Intel Iris Plus Graphics 640
Will this run sims 4 smoothly with medium settings and with cc and mods?
Next, have you "unzipped" your CC/Mods? All CC/Mods should end in the ".package" extension. You will need a program to "uncompress" these files. I recommend Stuffit Expander. It's free and you should be able to find it by searching Google.
Please advise if you have tried these steps and/or if this helps.
1) Move your Sims 4 folder to your Desktop. DO NOT DELETE IT!
2) Start up your Sims 4 game remembering that none of your saved games will be available at this time.
3) Create a new Sim and play for about an hour to see if anything else is happening with your game. Exit and save the game as normal.
Now when you are in the new game, remember a couple of pieces of the CC you recently added (like clothes, hair or makeup) and see if any of those show up in CAS. If they do not, then that's ok.
I know that some CC is placed in the Tray Folder instead of the Mod Folder. I always check to see if the creator specifically states where to place the CC.