~/code/graphql $ ruby -v
ruby 2.3.3p222 (2016-11-21 revision 56859) [x86_64-darwin14]
~/code/graphql $ ruby struct_bench.rb
========================================
Create and Access
========================================
Warming up --------------------------------------
             Hash#[]   118.707k i/100ms
          Hash#fetch   113.228k i/100ms
              Struct   195.640k i/100ms
          OpenStruct     9.301k i/100ms
               Class    64.503k i/100ms
Calculating -------------------------------------
             Hash#[]      1.697M (± 4.8%) i/s -      8.547M in   5.049520s
          Hash#fetch      1.571M (± 7.7%) i/s -      7.813M in   5.012878s
              Struct      3.936M (± 4.0%) i/s -     19.760M in   5.028583s
          OpenStruct     98.347k (± 2.9%) i/s -    492.953k in   5.016646s
               Class    767.913k (± 4.0%) i/s -      3.870M in   5.048166s

Comparison:
              Struct:  3936003.4 i/s
             Hash#[]:  1696710.9 i/s - 2.32x  slower
          Hash#fetch:  1570913.6 i/s - 2.51x  slower
               Class:   767912.6 i/s - 5.13x  slower
          OpenStruct:    98347.4 i/s - 40.02x  slower

========================================
Create
========================================
Warming up --------------------------------------
                Hash   125.138k i/100ms
              Struct   212.084k i/100ms
          OpenStruct    57.104k i/100ms
               Class    64.532k i/100ms
Calculating -------------------------------------
                Hash      1.859M (± 4.0%) i/s -      9.385M in   5.057965s
              Struct      4.707M (± 3.9%) i/s -     23.541M in   5.009567s
          OpenStruct    693.644k (± 3.5%) i/s -      3.483M in   5.027858s
               Class    787.318k (± 5.9%) i/s -      3.936M in   5.019975s

Comparison:
              Struct:  4706838.4 i/s
                Hash:  1858592.0 i/s - 2.53x  slower
               Class:   787317.8 i/s - 5.98x  slower
          OpenStruct:   693644.2 i/s - 6.79x  slower

========================================
Access
========================================
Warming up --------------------------------------
             Hash#[]   284.267k i/100ms
          Hash#fetch   262.122k i/100ms
              Struct   282.285k i/100ms
          OpenStruct   205.608k i/100ms
               Class   293.014k i/100ms
Calculating -------------------------------------
             Hash#[]      8.841M (± 7.8%) i/s -     43.777M in   5.004526s
          Hash#fetch      6.977M (± 5.0%) i/s -     34.862M in   5.009896s
              Struct      8.774M (± 4.3%) i/s -     44.036M in   5.028365s
          OpenStruct      4.297M (± 3.5%) i/s -     21.589M in   5.030635s
               Class      9.553M (± 5.9%) i/s -     47.761M in   5.017911s

Comparison:
               Class:  9553056.9 i/s
             Hash#[]:  8840715.6 i/s - same-ish: difference falls within error
              Struct:  8774498.7 i/s - same-ish: difference falls within error
          Hash#fetch:  6976943.2 i/s - 1.37x  slower
          OpenStruct:  4296913.4 i/s - 2.22x  slower