Go's Built-in Map Now Uses Swiss Table Hashing for Better Performance

Go's built-in map data structure has adopted the Swiss table algorithm, a modern hash table design originally developed by Google's Abseil team. The Swiss table improves upon traditional open-addressing hash maps by using a metadata byte array to enable fast SIMD-style lookups. This design allows Go's runtime to locate, insert, or delete keys more efficiently by scanning groups of slots in parallel rather than one at a time. VictoriaMetrics published a detailed technical breakdown explaining how the implementation works under the hood in Go's runtime. The post has drawn attention from the developer community on Hacker News, highlighting growing interest in Go's evolving internals.