Same issue here. Menu LAG / Stuttering as per video posted above.
tested on:
Win 7 x64
4GB ram
AMD radeon hd 6900
Intel core2 Quad Q6600 2.4ghz
2560 x 1440 (16:9)
Dirext X 11
All graphics setting set to LOW
Task manager performance shows TrainFever.exe 20 – 25 %cpu utlisation and 100mb mem.
Game map loads but same issue during play.
Same issue at any resolution.
Any ideas ?