How did you do that?
I've always had inevitable slowdowns in Defiance Bay and I've
proved it before
My PC is the following: i7 4790k, 16GB DDR4 RAM, GTX 980 Ti.
3840x2160, and I'm running around Copperlane with 55+ FPS. Only in the middle of the market does it go around 50-49, and in the place you showed it drops to 46-48, but I don't really care, who spends any time there anyway. The other Defiance bay districts are at 60+ FPS.
Stalwart is more choppy however - it averages around 45-47.
Here is a screenshot for you:
Re how -- I don't know, I'm not doing anything special. Once advice I can give you is stop all your torrent clients. You should never run a torrent client at the same time as your steam client anyway, because ol' Gabe is spying what processes you are running, and
is bad. Also stop your browsers, and anything else that could be taking up RAM and CPU resources. I don't know if you are running PoE through the Steam client, but the client is a little hog too. One more reason I buy from GoG whenever I can.