This is actually a very cool and insightful blog post. I'd have liked if the code was worked better into the written text however. I mean it didn't dive deep into it's Java usage or the specifics of the JVM, other than it being very well optimized for short lived objects.

However, the precise performance numbers should be taken with a grain of salt. I'd classify this as a micro benchmark and those can often be influenced by stuff like cache locality and other small details and could look quite different on other machines.