If you're having framerate issues, please check your specifications against our 'Minimum' and 'Recommended' specifications on our Steam store page here http://store.steampowered.com/app/333930/. If you fall below these, you will have performance issues. If you meet these requirements it could be you don't have the correct video settings in-game. If you already meet these specifications and want a higher framerate, you can try the following to improve performance of your machine in general:
Change in-game settings
Set the Video options to the 'Minimal' preset
Lower the resolution
Ensure that your video drivers up to date
Clean up space on your harddrive
Disable or remove unwanted programs
Clean your system registry
Defragment your hard drive
Set Windows to 'Best performance'
Set Windows Power Mode to 'High performance'
Keep your PC/Laptop well ventilated to prevent overheating