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Feb 25, 2017 at 20:11
I used to think it odd that JITs rarely beat AOT because a JIT has more info. Turns out JITs can't afford powerful but slow optimisations.

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May 22, 2022 at 23:14
It's strange how AOT compilers usually have different modes for optimising time or space usage, but JITs rarely have modes like "prefer fast startup". The vast majority of JITs seem to focus on runtime of hot code after warming up.
Aug 17, 2020 at 00:49
This comparison of OpenSmalltalkVM and TruffleSqueak is a really effective demonstration of JITs. TruffleSqueak initially has a lower framerate, but eventually exceeds OpenSmalltalkVM. As soon as the GUI is used (at 3:30), the framerate drops again!
Mar 30, 2020 at 01:00
JITs are blackboxes that can make it hard to reason about performance in production:
JITs are un-ergonomic
I lift my LAMP beside the github door. Keep ancient Fortran your storied numeric libs cries she. Give me your interpreted, your slow, the wretched refuse of your (insert pun for ‘teeming shore’).