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"really, really fast"

Compared to what? Polar bears?

Here: is it faster than warm JVM?

V8 is almost never faster than a warm JVM, especially once you get to heap sizes bigger than a couple GB.

You can't even store more than 14m or so keys in a map in Node w/o reaching for an off heap solution due to hard limits in the runtime...

If needed you can make your own map that doesn't let you down: https://www.npmjs.com/package/infinity-map

I've used megahash with great success:

I would freeze before the JVM would warm up.

Jokes aside, then maybe your code cache size is too small ;p