Re: Lagging / lag in game

@iridameridies  Please disable any apps that include in-game overlays, for example Discord or Steam.  Disable the EA App in-game overlay too; the option is within the standard settings.

If that doesn't help, please try playing in a clean user folder, as a test.  Move the entire Sims 4 folder out of Documents > Electronic Arts and onto your desktop, and when you launch the game, if it launches, 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 let me know whether you can get far enough to start a new save and play in live mode for a bit.