test.rb

require "benchmark"
Benchmark.bmbm do |x|
  x.report("min") { (1..10000000).to_a.shuffle.min }
  x.report("max") { (1..10000000).to_a.shuffle.max }
end

# Ruby 2.4-rc
          user     system      total        real
min   0.750000   0.000000   0.750000 (  0.756316)
max   0.770000   0.020000   0.790000 (  0.794998)

# Ruby 2.3
          user     system      total        real
min   1.290000   0.070000   1.360000 (  1.363364)
max   1.150000   0.040000   1.190000 (  1.186492)