block_benchmark.rb

def baz(x)
  x + yield
end

def bar(&block)
  baz(1, &block)
end

def foo(&block)
  bar(&block)
end

def foo_with_manual_delegation
  bar_with_manual_delegation { yield if block_given? }
end

def bar_with_manual_delegation
  baz(1) { yield if block_given? }
end

require "benchmark/ips"

Benchmark.ips do |bm|
  bm.report("&block") { foo { 1 } }
  bm.report("manual") { foo_with_manual_delegation { 1 } }
  bm.compare!
end