The Digital Press

Ruby 3.5 introduces a major optimization that makes object allocations up to six times faster by inlining the Class#new method, reducing overhead and improving performance especially with keyword parameters.

Why it matters: Faster object allocation speeds up Ruby applications, benefiting performance-critical code like Rails and Active Record.

Stunning stat: Ruby 3.5 is over 6.5 times faster than 3.4.2 for keyword parameter initialization with YJIT enabled.

The big picture: The optimization eliminates stack frames and parameter copying by inlining Class#new, improving inline cache hits and reducing method call overhead.

Commenters say: Users appreciate the deep optimization and speed gains, wonder about YJIT’s future with ZJIT, and discuss implications for Rails and broader language trends.