Sims 3 Mac sound delay and crashes

gk0604xm7y0o​  Please try playing with all your packs but in Sunset Valley.  If you still see issues, remove Pets and try again.  You'll need to start a new save, as one that has used a given expansion will likely be corrupted if you try to load it without that expansion in place.

To "uninstall" Pets, simply drag the EP05 folder out of the "The Sims 3 Packs" folder, which will be alongside the Sims 3.app wherever you installed the game.  To "reinstall" Pets, restore the folder.  You can remove and add back any expansion or stuff pack this way.

If removing Pets doesn't help either, remove your other expansions (not stuff packs, they're fine) one at a time until you find the culprit, then add the others back one at a time to make sure they're fine.  Please let me know which EPs give you trouble.

Given your laptop's hardware, you should in theory be able to play with all packs in any world, with the possible exception of Isla Paradiso, which is too broken to run well on any computer.  But clearly that's not the case here.

While testing, please restart your Mac immediately beforehand, and don't open any other apps.