@BrattyKayy01 The "sync pending" message likely refers to OneDrive waiting to sync the files. You can cancel it:
https://support.microsoft.com/en-us/topic/how-to-cancel-or-stop-sync-in-onedrive-4885c27e-3d89-4d69-be75-2646c71367d3
and then set OneDrive to not sync the contents of Documents:
https://support.microsoft.com/en-us/office/choose-which-onedrive-folders-to-sync-to-your-computer-98b8b011-8b94-419b-aa95-a14ff2415e85
and you shouldn't have this particular issue again.
If you do the above and still see performance issues with Sims 4, please try playing with no modds or custom content at all, as in, move the entire Mods folder to the desktop. You don't need to save your progress; just let me know whether you notice an improvement.
