JMH

RoaringBitmapRoaringBitmap/RoaringBitmap

A compressed bitmap data structure for Java that outperforms alternatives like WAH, EWAH, and Concise in speed and compression.

JCToolsJCTools/JCTools

High-performance concurrent data structures for the JVM, supplementing the Java standard library.

rtreedavidmoten/rtree

Immutable in-memory R-tree and R*-tree implementations in Java with a reactive API for spatial indexing.

jammjbellis/jamm

A Java agent and library for measuring actual object memory usage, including JVM overhead, across multiple Java versions.

HikariJSONbrettwooldridge/HikariJSON

A high-performance JSON parser for Java 8 focused on speed and minimal memory footprint.

fast-uuidjchambers/fast-uuid

A high-performance Java library for parsing and writing UUIDs, significantly faster than the standard JDK implementation.

RTree2DSizmek/rtree2d

A 2D immutable R-tree with STR packing for ultra-fast nearest and intersection queries in plane and spherical coordinates.