[Dylan16807]

Plenty of game engines are already spending less than a millisecond of CPU time per frame in their own code, so 2x one way or the other makes almost no difference.

Things don't need to be "exceptionally" fast to be in the area where programming language doesn't really matter.

> Twice the performance on a server could let you handle twice as many concurrent sessions (and possible run half as many servers!)

Which might matter, or it might not. Very situational.

> People regularly fight tooth and nail to squeeze 10% performance boosts on critical tasks, doubling it would be incredible

That kind of task is a small fraction of tasks. And often you're best off using a library, which can often make its own language choices independent of yours.