How do I reduce sims 4 lag

@KhiaTionna  Alright, then what you'll need to do is find a balance between using all the custom content you want and smooth gameplay.  I'm not saying you can't use any cc, only that you probably need to prune your collection.  One thing that can help with loading times, although not necessarily once you're past the loading screen, is suppressing the pop-up that lists your mods and cc at the Main Menu.

If you have different saves that use different sets of cc, you can also have multiple copies of the Sims 4 user folder (the one in Documents > Electronic Arts), one for each save and cc collection.  That would limit what the game has to load in one go, and the cc you're actually using would still be available in that save.  The game will only read the folder that's called "The Sims 4" without any other characters; renaming the folder prevents it from being used.  So you could give each folder its own descriptive name, then rename the one you want to use to "The Sims 4" to have the game read it again.

I have three or four Sims 4 user folders and about a dozen for Sims 3, and this works quite well for me.  It does take some getting used to, but once you've set things up, it's easy to manage.