Also wondering this. I found a comment on StackOverflow from 2015 [0] that might offer some insight: > "It's probably worth mentioning that V8 goes to great le

Also wondering this. I found a comment on StackOverflow from 2015 [0] that might offer some insight: > "It's probably worth mentioning that V8 goes to great lengths to avoid using a hash table for object properties whenever possible, preferring to compile known property references into direct index references rather than run-time hash lookups for performance reasons (though this is only possible sometimes - depends upon the code)." Since this blog posts mentions they store the hash code as a property of the object, that might imply they are using "direct index references" instead of computing the hash at runtime. It does seem like a couple layers of indirection, though. This is way outside my expertise, so I would love to hear some more comments on this. [0] https://stackoverflow.com/a/30695791/7252597 https://stackoverflow.com/a/30695791/7252597