Your specs look alright, so it could be related to a software or driver issue.
CTRL+SHIFT+ESC and then into “Processes”. Look for any rogue processes that seem to be taking more than their fair share - some anti-virus applications can be particularly taxing on system resources.
Also, if you’re on a traditional hard drive (HDD) and not an SSD, you may want to run a defrag on your drive (don’t ever run a defrag on an SSD, as you’ll burn it out for no reason). If your hard drive is having to seek a lot, this can cause some stuttering in games as the drive struggles to retrieve the files that the game is asking for.
Finally, make sure your GeForce drivers are up to date, just for good measure. Sometimes it can help to select the “clean install” option whilst updating.
Hope this helps!