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They use the same engine.

The difference is that the maps in Recharged is bigger and more detailed. So the are more demanding graphics-wise.

You can try to run Recharged at lower resolution to get better performance.

In windows you can set the resolution by using command line parameters as described in the manual:

https://drive.google.com/file/d/0BwSDHIR7yDwSelpqMlhaSzZOa1k/view?usp=sharing