如果您没有可以生成代码来利用底层处理器架构和指令集的编译器，那么最快的机器也将是无用的。

If you don't have a compiler that can produce code to take advantage of the underlying processor architecture and instruction set, then the fastest machines will be useless.

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早期的程序设计利用机器代码指令在裸机层次上完成。

Early programming was done at the bare machine level, using machine code instructions.

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JIT通过将代码编译成机器码，这样可以减少翻译Python指令的时间，以此提高代码的执行速度。 “在CPython里，” Winter 解释道，“这一部分的开销很大；在这方面只做了较小的调整就使CPython 2.7有了近15%速度提升。”

Using a JIT will speed up execution by compiling to machine code, thus eliminating the overhead of fetching, decoding, and dispatching Python opcodes.

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