I initially also saw my frame rates cut in half, which was not good. It turned what would normally have been a playable frame rate (20-40, depending on location and altitude) into a 10-20 fps slideshow. That shouldn’t have been happening with an RTX 2080 and Ryzen 2700X.
I upgraded to the latest nVidia driver and changed settings in my nVidia control panel to mirror what’s in the post below. I found myself with frame rates pretty much stuck in the 40-60 range. That was so awesome that I’ve gone into my in-game graphics settings and actually started cranking up detail on a lot of stuff to a mix of ultra and high instead of high and medium. Even brought my glass cockpit refresh back up to high now so it’s nice and smooth.
Now I’m consistently over 30 fps and only dropped in the high 20s in some large, busy cities (New York, San Francisco and Toronto specifically). I couldn’t be more pleased with the results. Now it looks better and runs a lot faster.