Well I've been happy about hearing what to expect from this game, and they pretty much appear to deliver what they promised. Judging from reviews it sounds like the game is feature complete but very unoptimized. Yes performance a major issue, game breaking for many, but this will be fixed in time. If you're getting it try City Planner Plays' recommended settings from his benchmarking video around 17 minutes. Most importantly turn off Vsync.