Game stutters every other second! RTX 3070!

@fluffytiera  There's nothing obviously problematic in your dxdiag, although it's worth disabling the Game Mode and Game Bar, as the XBox gaming overlay did crash at least once.  Both toggles are under Windows Settings > Gaming.

The unrecognized graphics card shouldn't be an issue either, but if you want to get it recognized, add this line to graphicscards.sgr, under the NVIDIA header:

    card    0x2488  "NVIDIA GeForce RTX 3070"   $cardLevelUber  $resolutionHigh

Make sure this entry lines up with the others; there should be four spaces before "card."

The next step to try is to play while your computer is completely offline.  I realize it's not a good long-term solution, but it's a useful test.  You can sign into Origin or the EA App and put it in offline mode, then disable wifi and/or disconnect the ethernet cable before pressing Play.

While doing this, please test a new save in one of the base game worlds, and also let me know what framerates you're seeing.  If you don't have a third-party tool to show you, the cheat fps on will make the counter appear in the lower-left corner, over the user interface.