Very poorly optimized, but with a lot of tweaking I got it to a pretty stable frame rate, but it still stutters a lot while driving, and a tiny but while walking around the city.
It's pretty poorly optimized. There are a couple fixes for the stuttering problem that I tried, some command line input on startup. Don't remember it but I'm sure it'll turn up if you google it. It seemed to work pretty well for me.
I'll have to try this.