Low FPS/Windows 11

@hilderstone  If you'd like to do some hardware monitoring and have me look over the results, I'd be happy to (although it might take a couple days before I have time).  I don't know that the log would have any useful info, but it couldn't hurt.  Download hwinfo from here:

https://www.hwinfo.com/download/

You don't need to install anything; just choose the portable version, unzip it, and launch it from Downloads or wherever you want to keep it.  (If you do want to install it, make sure to click the button for hwinfo itself, not for lansweeper.)  Restart your computer, launch hwinfo, and click the button that's a sheet of paper with a + on it to start logging.

Wait five minutes, then launch Sims 4 and play for at least 20 minutes, using your normal settings so you see the usual low framerates.  When you're done, click the same button to end logging.  You can upload the log to the third-party filesharing site of your choice (Google Drive, Dropbox, etc.) and link it here.  Please leave it in .csv format, or if you're using OneDrive to host it, zip it first.

I don't have any other suggestions at the moment, unfortunately.  There are plenty of reasons why Sims 4 can run slowly, but a new save in a base game world should be more than fine on your hardware.