Jun 20, 2026 · Backend Development

FastUtil High‑Performance Collection Best Practices: Speed Up Your Java Programs

FastUtil, an open‑source library maintained by Sebastiano Vigna, offers type‑specialized Java collections that are typically 2–5× faster and use 40–70% less memory than JDK equivalents, and this article provides detailed benchmarks, a cheat‑sheet of core types, production‑ready code snippets, Maven/Gradle setup, and a checklist of common pitfalls to help developers adopt FastUtil safely and efficiently.

CollectionsFastUtilJava

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FastUtil High‑Performance Collection Best Practices: Speed Up Your Java Programs

Java Backend Technology

Jun 1, 2026 · Fundamentals

Why Is fastutil Up to 10× Faster Than Java’s Standard Collections?

fastutil dramatically outperforms Java’s standard collections by eliminating boxing, cutting memory usage and GC pressure, offering primitive‑specific maps and lists, providing 64‑bit indexed BigArrays for massive data, and delivering faster I/O utilities, all while remaining API‑compatible.

BigArraysFastUtilJava collections

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Why Is fastutil Up to 10× Faster Than Java’s Standard Collections?