Re: sims 3 64bit Mac crashing
@Sopolainen To set a baseline for performance, please try playing a new save in a clean user folder. Move the entire Sims 3 folder out of Documents\Electronic Arts and onto your desktop. When you open the launcher, a clean folder will spawn with no content. Don't add anything to it yet, and don't change any settings, unless you want to switch the resolution or use windowed mode; just start a new save in Sunset Valley and see how it runs.
If the game crashes, load it to the Main Menu, put the settings on low, quit to desktop, load another new save, and let me know whether you still have issues.
This will not delete your existing saves and other files: everything will be in the Sims 3 folder you moved, but the game won't be reading that data. Once things are stable, you can start adding content back. However, since some of that content may be a problem, it's important to test anything you want to keep using.