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IMPORTANT NOTE:
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If you experience serious frame-rate problems, you
may need to set your graphics card's color depth to
a higher setting, such as 24 or 32 bits.

On WINDOWS:
1) Right click on the desktop
2) Click "Properties"
3) Click the "Settings" tab
4) Find the "Colors" drop down menu
5) Set color depth to "True Color (32 bit)" or your highest available setting

Another way to speed up the game could be to lower the resolution.
If you want to change the resolution/screen mode, modify the file params/params.txt.
It should take the format:

[width] [height] [fullscreen]

For example:
800 600 false - play the game in an 800x600 window
1024 768 true - play the game in a 1024x768 fullscreen mode
