@annahjartoy Yeah, we're still waiting for the Metal upgrade, Windows users are still waiting for the dropping of 32-bit support too -
https://answers.ea.com/t5/Technical-Issues-Mac/The-Sims-4-Update-on-Supported-Systems/m-p/7677539#M1...It is weird that you're not getting the higher fps though. Let's hope Metal is the key, sorry I couldn't be of any use!