The cost of binding lambdas to context in Ruby

bm.rb

require 'benchmark'

foo = -> {}

_ = BasicObject.new

def _.bar
end

n = 4_000_000
Benchmark.bm(7) do |x|
  x.report("context") { n.times { foo.call } }
  x.report("none") { n.times { _.bar } }
end

#               user     system      total        real
# context   0.630000   0.010000   0.640000 (  0.647041)
# none      0.390000   0.000000   0.390000 (  0.395646)