I think i know what's causing those annoying stutters. First thing you'll want to do is jump into the nvidia control panel and set a frame limit just below your monitor's refresh rate if you're running at 60hz go for about 58fps that kind of thing. The timing here is pretty important since the engine gets unstable past 187fps. Getting your sync settings right makes a huge difference too so enable adaptive v sync if you've got an nvidia card, or g sync if your monitor supports it.

Your refresh rate needs to match what your monitor can actually do, so double check those display settings. When you're cruising around busy areas, especially downtown, you might want to dial back stuff like msaa and view distance a bit since those hit performance pretty hard. Something that catches people out a lot is their antivirus scanning the game files while playing, so adding the exe and launcher to the exclusion list can help smooth things out.

Good to know: keep those gpu drivers current too since newer versions often include specific fixes. The biggest improvement usually comes from that external frame cap and sync settings working together, but if you're still seeing issues try combining that with the graphics tweaks. Just remember the frame timing is super important here getting that cap set just right makes all the difference when you're trying to get rid of those micro stutters.