If you are playing Stronghold Crusader 2 on a Laptop and are experiencing low fps or serve lagging. The game could be trying to use your internal graphics chip and not the NVidia graphics chip.  To get the game to use the NVidia chip, please do the following :

1. Click on Nvidia control panel
2. Select manage 3d settings
3. Global Settings tab
4. Switch the drop down from Auto to Nvidia
5. Reboot your computer