I think they first aimed to optimize the single methods instead for optimizing the combinations for the simple reason that improving the performance for a single method directly improved the performance of every combination it was used in whereas you have many more combinations to improve to yield effects.
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To be honest, I'm baffled that Javascript runtimes don't do any kind of optimisation already.
I think they first aimed to optimize the single methods instead for optimizing the combinations for the simple reason that improving the performance for a single method directly improved the performance of every combination it was used in whereas you have many more combinations to improve to yield effects.