Ruby 3.3.0 has been released, featuring several new additions and performance improvements. The release introduces Prism, a new parser for the Ruby language, which is considered production-ready and can be used as an alternative to Ripper. The Lrama parser generator has been added, replacing Bison for improved maintainability. The YJIT compiler has also seen major performance improvements, with better support for splat and rest arguments, optimized basic methods, and improved memory usage. Other notable updates include the introduction of the M:N thread scheduler, performance improvements to the garbage collector, and enhancements to IRB. The release also includes updates to the standard library and bundled gems. Overall, Ruby 3.3 offers improved performance and additional features for developers.
https://www.ruby-lang.org/en/news/2023/12/25/ruby-3-3-0-released/