fast-uuid

Benchmarks show 14x faster parsing than Java 8's UUID.fromString() and 6x faster than Java 9+, using a specialized, allocation-efficient parser that avoids substring splits and concatenations.

For Java 8, UUID-to-string conversion is up to 6x faster by pre-allocating StringBuilders and minimizing intermediate string allocations, though it smartly delegates to the native JDK in Java 9+ for best performance.

The library is designed to avoid unnecessary object allocations during both parsing and writing, making it ideal for high-throughput scenarios where garbage collection overhead is a concern.

It's a lightweight library with no external dependencies, easily integrated via Maven Central or by adding the jar directly, as highlighted in the README's usage section.