Sims 3 Lagging Severely Despite High-End PC – Need Help

fmlovetm3​  First, please remove any files recommended by that video, and run a game repair.  It looks like you're running a Steam install, so that would be Sims 3 > Properties > Installed Files > Verify integrity of the game files.  The suggestions in the video are mostly unnecessary, often counterproductive, and often outright harmful.  Even aside from that, it's always best to start vanilla, or close to it, and only make changes gradually, observing the effects before implementing anything else.

Please also move or rename the Sims 3 folder in Documents > Electronic Arts so the game can't read it.  A new folder will spawn when you open the launcher.  Don't add anything to it yet; just start a new save in Sunset Valley and see how it runs.  You don't even need NRaas mods for a new save in SV to run well for a little while, much less so it's a good test.

The fps counter is just a number in the upper-right corner that reflects the game's current framerates.  It's a way to confirm that your fps limit is working, and it's critical to do so.

I bought and installed all the DLCs at once before playing.

The game lagged right from the beginning — even during Create-a-Sim. I tried playing in three of the top recommended worlds, but the lag was still severe during gameplay.

I set the game to cap at 60 FPS and adjusted the settings to default and even lower, but it didn’t help.

I’m not sure about the FPS counter you mentioned, but I did follow acottonsock’s instructions (from the popular performance guide). Unfortunately, it didn’t solve the problem either.

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fmlovetm3​  What world(s) are you playing in, and how does the game run in Sunset Valley?  What expansion packs have you installed?

Have you taken steps to limit your in-game framerates, and have you confirmed that the limit is being respected?  You can bring up the cheats console (ctrl-shift-C) and enter fps on to show an fps counter in the upper-right corner of the screen.

Please also provide a dxdiag.  Click Windows key-R, enter dxdiag in the run box, wait for the scan to finish, click "Save all information," and save the file to your desktop.  From there, you can attach it to a reply using the paper clip (Attachment) icon included with the other formatting buttons.