@smilelikemiles Just checking, but you don't happen to have Sims 4 installed on an external drive, do you? There's no external drive listed in your dxdiag, but you could have unplugged it, and an issue with the external or its connection could explain the issue.
Otherwise, please 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
When you reboot, go through the Task Manager's background tasks list shutting down everything that doesn't absolutely need to be running, so basically anything that isn't from Microsoft, Intel, or Nvidia. If you accidentally kill the wrong process and it doesn't restart on its own, just reboot your computer. And if you shut something down that isn't critical and it does restart, please make a note of it. As an example, this has been an issue with Razer software recently, and while this may or may not be contributing to your issue, it's useful to know that you may need to account for this.
While testing in the clean boot, please also disable your antivirus, if you have one. And use a(nother) clean Sims 4 folder as well.
Finally, while the game is loading, please open the Task Manager and look at CPU use and temperature in the Performance category. Let me know what you see for both. If Sims 4 isn't already set to launch in windowed mode, you can force it to do so (so you can easily switch to the Task Manager): open your Origin game library, right-click on the Sims 4 icon, select Game Properties > Advanced Launch Options, enter -w in the command line box, and save.
When testing, you can shut down Sims 4 in the Task Manager any time it's been loading without making any progress for more than about five minutes. Since you'll be using a clean folder with no mods or custom content, it really should only take a minute or two to load, so after five minutes, you'll know that the issue hasn't been fixed.
@roberta591 I'm not sure what you're looking at in the dxdiag. The page file is large enough—less than half of it is in use—and is probably dynamic. And the Nvidia driver is definitely WHQL, as you can see by comparing the version with the one listed on the Nvidia driver download page:
https://www.nvidia.com/Download/driverResults.aspx/190553/en-us/