Earlier quoted context omitted.
> The thing about JIT languages is that there's no such thing as overall speed of a particular operation; you can only sample current speed on current implementations. How in the world is that specific to JIT? Have you never heard of a Sufficiently Smart Compiler?
The main difference is that you the developer can test with a known compiler and know what the performance characteristics are before you release your code: when Microsoft releases VisualStudio 2018, your existing application doesn't change until you rebuild it. In contrast, for code running in a web browser or something like the JVM, your existing code may run faster or slower without you even knowing about the new…
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