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Ref: https://bugs.ruby-lang.org/issues/20641 Even without the reference bug, `require 'date'` isn't cheap. ```ruby require "benchmark/ips" require "yaml" require "date" 100.times do |i| $LOAD_PATH.unshift("/tmp/does/not/exist/#{i}") end payload = 100.times.map { Date.today }.to_yaml Benchmark.ips do |x| x.report("100 dates") { YAML.unsafe_load(payload) } end ``` Before: ``` $ ruby /tmp/bench-yaml.rb ruby 3.2.2 (2023-03-30 revision e51014f9c0) [arm64-darwin22] Warming up -------------------------------------- 100 dates 416.000 i/100ms Calculating ------------------------------------- 100 dates 4.309k (± 1.2%) i/s - 21.632k in 5.021003s ``` After: ``` $ ruby -Ilib /tmp/bench-yaml.rb ruby 3.2.2 (2023-03-30 revision e51014f9c0) [arm64-darwin22] Warming up -------------------------------------- 100 dates 601.000 i/100ms Calculating ------------------------------------- 100 dates 5.993k (± 1.8%) i/s - 30.050k in 5.016079s ```