"while true" is faster than "loop do"

gistfile1.rb

require 'better-benchmark'

result = Benchmark.compare_realtime(
  :iterations => 10,
  :inner_iterations => 10,
  :verbose => true
) {
  count = 0
  while true
    count += 1
    break if count == 100_000
  end
}.with {
  count = 0
  loop do
    count += 1
    break if count == 100_000
  end
}
Benchmark.report_on result

# % ruby ~/ruby/loop.rb
# ..........
# Set 1 mean: 0.480 s
# Set 1 std dev: 0.002
# Set 2 mean: 0.700 s
# Set 2 std dev: 0.013
# p.value: 1.0825088224469e-05
# W: 0.0
# The difference (+45.9%) IS statistically significant.