FPS... what do I need to upgrade to get 40+fps stable on highest moving speed?

Can you share a log file from a session when you see it? The log is %LOCALAPPDATA%\Turbulenz\Boundless\log.txt

The shorter the session the easier it will be to see what is using the CPU. i.e. boot the game, run around that location until you reproduce it for a while and then exit the game. You need to exit as it logs some performance info then.