In my case the lag occurs in the submenus and in game. The main menu is fine.
I have tried the graphics settings at high and at low, and have also tried dropping the resolution from 1920 x 1080 to 1280×800.
My system specs:
Processor: AMD Phenom II X4 965 @ 3.4GHz
Memory: 16 GBytes DDR3 RAM
Graphics: ATI Radeon HD 5870 with 1024 MBytes GDDR5 (Clocks Core: 850 MHz / Memory: 1200 MHz)
HDD: 500 GBytes SSD (Samsung EVO 840)
OS: Windows 7 Ultimate – 64Bit
Graphics Driver Version: atiumdag 14.301.1001.0 (Catalyst 14.9)
Train Fever – Build 4519 Windows 64-bit
