@classicacosta This is kind of a difficult problem to address. One possible cause of the graphics glitches in your screenshot is changing the graphics settings while you have a save loaded, or changing them at the Main Menu and then immediately loading a save, without quitting first. So don't do that, or if you have, delete options.ini (again) and let the game create a new one.
It should also be mentioned that deleting the WorldCaches files in Documents > Electronic Arts > The Sims 3 can have significant negative effects in the 32-bit version of Sims 3 for Mac; I don't know if those have carried over to the 64-bit version, but don't delete those files either.
It would be unusual for custom content to produce this issue, but you should still try playing without it, just as a test. Use "save as" to rename your save, so your original remains intact with all its cc still present, then load the game without cc a couple of times to see whether it helps.
Another possible cause of the glitches is that your graphics chip or its driver doesn't seem to work well with Sims 3. I'm not sure why, but you're one of a number of players with this particular class of processor and graphics chip with significant graphics issues. If this is the underlying cause, there's not much you can do about it except hope Apple releases a more cooperative driver, which would be bundled with the OS. (So keep your operating system up to date.)
It's also possible that there's a problem with your laptop's hardware. I certainly can't diagnose it from here, and I don't even think it's particularly likely, but I want to mention it just so you're aware. If you have the ability to take your laptop to an Apple Store to get it checked out, it may be worth doing so, if for no other reason than you'd be able to stop wasting your time troubleshooting what turned out to be a hardware issue. If you can't get to a store right now though, don't worry about it too much.