Time benchmark

bm.rb

# gem install benchmark-ips
require 'benchmark/ips'

class << Time
  attr_accessor :current
end
Time.current = Time.now

Benchmark.ips do |x|
  x.report("Time.now") do |n|
    n.times do
      Time.now
    end
  end
  x.report("Time.current") do |n|
    n.times do
      Time.current
    end
  end
end

results.txt

Calculating -------------------------------------
            Time.now     77329 i/100ms
        Time.current    111682 i/100ms
-------------------------------------------------
            Time.now  2232278.9 (±4.2%) i/s -   11212705 in   5.032705s
        Time.current 13550961.4 (±7.1%) i/s -   67344246 in   5.003133s
ruby bm.rb  14.02s user 0.06s system 99% cpu 14.107 total