digest-crc 0.6.0 has been released. This release introduces optional C extensions, that when built on CRuby, will override the pure-Ruby CRC methods with C equivalents, providing a ~40x performance improvement. If the C extensions cannot be built (no compiler installed, no ruby.h headers, not using CRuby) digest-crc will fallback to using the pure-Ruby CRC methods.

Note: If you use ruby-kafka, run bundle update digest-crc to take advantage of the improved performance (see: https://github.com/zendesk/ruby-kafka/issues/620).