1. Right click anywhere empty on the desktop and choose NVIDIA Control Panel
2. From the left menu, pick Manage 3D Settings and select Program Settings
3. Click Add and pick Xenclient.exe (or browse the game folder for it)
4. Select the preferred graphics processor for this program: High-Performance NVIDIA Processor
The graphics driver isn't familiar with this game, so by default the game uses the integrated power saving graphics instead of the gaming one.
This should correct it and fix any stuttering and low frame rate.