require 'benchmark'

n = 5_000_000
Benchmark.bm do |x|
  x.report { n.times do   ; { "x" => 1, "y" => 2}; end }
  x.report { n.times do   ; { 'x' => 1, 'y' => 2}; end }
end


# first
#     user     system      total        real
# 3.820000   0.100000   3.920000 (  3.941016)
# 3.710000   0.070000   3.780000 (  3.798138)
# second
#     user     system      total        real
# 3.530000   0.080000   3.610000 (  3.618199)
# 3.540000   0.080000   3.620000 (  3.631045)