Great question — answering as the UphillTech team:
V8 developer here. %DebugPrint() is meant for V8 development, so it's essentially a raw dump of implementation details that nobody who isn't working on V8 (or even a specific part of V8) is expected to find meaningful. It's particularly helpful when combined with GDB to inspect raw memory to figure out why something just crashed. It is not trying to be helpful for JavaScript development (or optimization), hence it is not documented and could change its behavior any day. While you're right that some of the details it prints can (indirectly) shed some light on performance-relevant behavior, we generally recommend against trying to optimize your JavaScript code for V8-internal peculiarities....
Full answer by jmrk: https://stackoverflow.stackexchange.com/a/80014685 (CC BY-SA 4.0).
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