JSON benchee results

Name                             ips        average
EEx template                719.37 K        1.39 μs
JSON.encode_to_iodata!      116.67 K        8.57 μs
JSON.encode!                109.08 K        9.17 μs

Comparison: 
EEx template                719.37 K
JSON.encode_to_iodata!      116.67 K - 6.17x slower +7.18 μs
JSON.encode!                109.08 K - 6.59x slower +7.78 μs

Memory usage statistics:

Name                      Memory usage
EEx template                 0.0859 KB
JSON.encode_to_iodata!         4.47 KB - 52.00x memory usage +4.38 KB
JSON.encode!                   4.53 KB - 52.73x memory usage +4.45 KB