@Audigirl1 Thanks for the dxdiag, but I don't see anything obvious that would account for the lag. I do see that Acer's registration software is crashing, so try disabling that in the Task Manager's Startup section.
For the Sims 4 issue, please try a new save and see how it goes. If the new save also lags, please try a clean folder. Move the entire Sims 4 folder out of Documents > Electronic Arts and onto your desktop, and when you launch the game,a clean folder will spawn with no content. (Your saves and other content will be intact in the folder you moved but temporarily not read by the game.) Don't add anything to the new folder yet; just test another new save and let me know how it performs.
If even the new save in the clean folder lags, please look for new errors in the Reliability Monitor. Hit Windows key-R and enter "perfmon /rel" without quotes, and you'll see a chart of errors and updates with a column for each day. Today is on the right.
Look for an error that happened at exactly the time of your most recent Sims 4 play session. If you find one, double-click it to see more details, then copy that info and paste it into a reply here. If you don't see a new error, check back in an hour or so—the Reliability Monitor doesn't always update right away.