Issue #10817 has been updated by Koichi Sasada. Status changed from Open to Feedback Sorry for late response. I try this on my environment, but not so big difference. Please reopen if you find it is still slow. ---------------------------------------- Bug #10817: [PERF] vm3_gc slower https://bugs.ruby-lang.org/issues/10817#change-54968 * Author: Guo Xiang Tan * Status: Feedback * Priority: Normal * Assignee: Koichi Sasada * ruby -v: ruby 2.2.0dev (2014-09-07 trunk 47444) * Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN, 2.2: UNKNOWN ---------------------------------------- http://rubybench.org/ruby/ruby/commits?result_type=vm3_gc When running locally, ----------------------------------------------------------- benchmark results: Execution time (sec) name ruby 2.2.0dev (2014-09-07 trunk 47443) [x86_64-linux] vm3_gc 1.946 ----------------------------------------------------------- benchmark results: Execution time (sec) name ruby 2.2.0dev (2014-09-07 trunk 47444) [x86_64-linux] vm3_gc 2.426 Tracked down to https://github.com/ruby/ruby/commit/123eeb1c1a904923754ce65148dbef045b56e083. Let me know if there is anymore information I can provide. -- https://bugs.ruby-lang.org/