Comprehensive JVM Primitive Hashtable Benchmarks 2026
Introduction
Hashtables are one of the building blocks of computer science, and deservedly get a lot of attention - but less so within the JVM ecosystem. Part of this may simply be that most JVM code is not written with performance top of mind, or that the default JRE implementation is all-around reasonable - fast, efficient, resistant against attacks, why fix it if it ain’t broke? Today we’re looking at libraries that are interested in squeezing out every last byte and cycle of performance however, and we’ll be focusing specifically on primitive hashtables.