@MSLsiblings The short version of this is, your computer has a lot of what some of us might call bloatware running, and collectively it's eating enough CPU resources that Sims 4 doesn't have what it needs to run properly. This is a problem on many computers, but particularly older ones with relatively weaker processors that can still handle any one or two significant tasks but not 20 at the same time.
Personally, I would disable everything that shows as Enabled in the Startup list, with the exception of Windows security notifications, plus OneDrive if you're actually using it. For the rest, you'll free up computer resources if you don't let them open with Windows, and it's trivial to open each app yourself when you have use for it. Even though none of these apps takes up much in the way of resources on its own, together they add up, as you can see from the fact that non-Sims 4 processes are using more than half your CPU.
If you really want one or two of them to start with Windows, that's probably fine; just be selective. For some of these, telling the app not to start with Windows is enough to remove it from the list entirely. For others, you can disable them from starting with Windows from this same screen.
Definitely also disable the Windows Feedback Hub, or at least set the frequency of feedback as low as possible. The setting should be under Windows Settings > Privacy & Security. If you don't use OneDrive, get rid of it; it's also using a lot of resources. If you do use it, disable syncing while you play.
https://support.microsoft.com/en-us/office/how-to-cancel-or-stop-sync-in-onedrive-4885c27e-3d89-4d69-be75-2646c71367d3
If none of this helps enough, try playing in a clean boot:
https://support.microsoft.com/en-us/topic/how-to-perform-a-clean-boot-in-windows-da2f9573-6eec-00ad-2f8a-a97a1807f3dd
The only service to leave running is the EABackgroundService, which the EA App needs in order to run. Disable everything else, as the article describes. When you reboot your computer, go through the Task Manager's background processes list again looking for any service that might still be running. If you accidentally kill the wrong process and it doesn't restart on its own, just reboot your computer.
If this helps, you can start adding back processes until you get to the point where you notice lag again, and then you'll know where the line is, more or less, and can adjust from there.