Issue #22220 has been reported by emanuelevans (Emanuel Evans). ---------------------------------------- Bug #22220: Performance regression when requiring `aws-sdk-ec2` in Ruby 4.0.6 https://bugs.ruby-lang.org/issues/22220 * Author: emanuelevans (Emanuel Evans) * Status: Open * ruby -v: 4.0.6 * Backport: 3.3: UNKNOWN, 3.4: UNKNOWN, 4.0: UNKNOWN ---------------------------------------- Ruby 4.0.6 introduced a large performance regression when loading `aws-sdk-ec2` (~30s on my machine, compared to <1s for ruby 4.0.5). Script to reproduce: ``` for v in 4.0.5 4.0.6; do docker run --rm ruby:$v-slim bash -c ' gem install --no-document aws-sdk-ec2 -v 1.402.0 >/dev/null 2>&1 ruby -e "t = Process.clock_gettime(Process::CLOCK_MONOTONIC) require \"aws-sdk-ec2\" printf(\"ruby %s: %.2fs\n\", RUBY_VERSION, Process.clock_gettime(Process::CLOCK_MONOTONIC) - t)"' done ``` It appears to be related to `Shape.new` and/or `Class.new` compile times; minimal reproduction: ``` for v in 4.0.5 4.0.6; do docker run --rm ruby:$v-slim ruby -e ' src = "class Shape\n def self.new(**) = nil\nend\nmodule M\n" + (1..16_000).map { |i| %( K_#{i} = Shape.new(name: "k#{i}")) }.join("\n") + "\nend\n" File.write("/tmp/bench.rb", src) t = Process.clock_gettime(Process::CLOCK_MONOTONIC) RubyVM::InstructionSequence.compile_file("/tmp/bench.rb") printf("ruby %s: %.2fs\n", RUBY_VERSION, Process.clock_gettime(Process::CLOCK_MONOTONIC) - t)' done ``` -- https://bugs.ruby-lang.org/