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While I find your second sentence quite insightful, the first sentence seems to fight a straw man.

(GP stated that this software is high-performance, and that it is written in C++. They didn't claim it to be high-performance because of C++.)

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My apologies. Way too often I hear people in the Minecraft community say everything would be magically fixed if the game had simply used C++ in place of Java. I guess I'm too quick to jump on people using "C++", "high performance" and "Minecraft-like thing" in one comment nowadays.

Well, tbh that is somewhat grounded in reality: lots of minecraft's early performance problems were caused by the GC, which wouldn't have been a problem if writing "idiomatic" C++.

Lots of those problems have since been fixed though. I believe a rewrite in C++ today would bring more problem than it solves (which, BTW, Mojang is kind-of doing with Minecraft PE).

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