[NiceGuy_Ty]

This is a well written article, and I absolutely agree with the idea that profiling and analysis is more important than language choice in order to eke out performance wins.

That being said, some of these optimization techniques completely took me by surprise. Defining the sort function as a cache lookup that converts the sorting template to a string and then builds an anonymous function out of that string which is finally used as the exported function seems, to me, like an extremely roundabout way to achieve inlining the comparator. And the argument-count adapter having such high overhead on V8 seems like something that should generate a warning for the developer.

The cache analysis and algorithmic improvements seemed fairly straight forward, but when you're at the point of having to manually implement memory buffers to alleviate GC pressure, you're diving below the level of abstraction that the language itself provides you. At that point, I think the argument to switch to a language designed to operate at that level of abstraction holds some sway.