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The server is written in C++ with libuv to abstract networking (since I test it on windows but the servers run on linux).

See my reply to madeofpalk for the other 2 answers.

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Why the decision to use C++ instead of NodeJS?

Probably speed.

Is it signifiant? I haven't even thought to lookup benchmarks.

Think that part of it is that only one process or thread can run at any given time in node. So, if you have a complicated multiplayer server, subroutines will start getting blocked.

The main limitation on a server capacity is CPU

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