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Comment by gf000

4 days ago

Refcounting is significantly slower under most circumstances. You are literally putting a bunch of atomic increments/decrements into your code (if you can't prove that the given object is only used from a single thread) which are crazy expensive operations on modern CPUs, evicting caches.

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gf000

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LtWorf  4 days ago

Under most circumstances function local variables aren't passed to other threads, or passed at all.

  • gf000  4 days ago

    And? That's a small, optional optimization done by e.g. Swift.

    Also, I don't know how it's relevant to Go which uses a tracing GC.