Some parts are in C++ and they even made it open source recently:

https://github.com/carbonengine

https://fenris.com/carbon

Does the game have performance issues? I don't see the need to rewrite unless there is a problem with it

> Every character, every skill point, every asset in every hangar, every ISK in every wallet was written in Python 2 code, and all of it must read back under Python 3 exactly as it was.

This task would be even more challenging under such a dramatic rewrite.

Python 3 will likely be faster by itself.

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