Issue #19334 has been updated by byroot (Jean Boussier). Backport changed from 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN to 2.7: DONTNEED, 3.0: DONTNEED, 3.1: DONTNEED, 3.2: UNKNOWN @mame would you consider 78fcc9847a9db6d42c8c263154ec05903a370b6b worth backporting? ---------------------------------------- Bug #19334: Defining many instance variables and accessing them is slow in Ruby 3.2.0 https://bugs.ruby-lang.org/issues/19334#change-101479 * Author: mame (Yusuke Endoh) * Status: Open * Priority: Normal * Assignee: tenderlovemaking (Aaron Patterson) * Backport: 2.7: DONTNEED, 3.0: DONTNEED, 3.1: DONTNEED, 3.2: UNKNOWN ---------------------------------------- ``` class C eval("def initialize; #{ (0..100000).map { "@x#{ _1 } = 0; " }.join } end") attr_reader :x50000 end p :start C.new.x50000 ``` This script takes less than one second in Ruby 3.1.3, and does more than ten second in Ruby 3.2.0. ``` $ time ruby -v test.rb ruby 3.1.3p185 (2022-11-24 revision 1a6b16756e) [x86_64-linux] :start real 0m0.210s user 0m0.167s sys 0m0.044s ``` ``` $ time ruby -v test.rb ruby 3.2.0 (2022-12-25 revision a528908271) [x86_64-linux] :start real 0m11.026s user 0m10.950s sys 0m0.040s ``` This problem is not critical, but is there any room for improvement? -- https://bugs.ruby-lang.org/