Was playing around with gogoprotobuf and here are the benchmark comparisons.
On develop branch with goprotobuf:
BenchmarkToPBMarshal_10_Actor-2 500000 2704 ns/op 712 B/op 7 allocs/op
BenchmarkToPBMarshal_10_Director-2 500000 3874 ns/op 1224 B/op 8 allocs/op
BenchmarkToPBMarshal_100_Actor-2 50000 24739 ns/op 6856 B/op 11 allocs/op
BenchmarkToPBMarshal_100_Director-2 50000 37483 ns/op 14792 B/op 13 allocs/op
BenchmarkToPBMarshal_1000_Actor-2 10000 173239 ns/op 70856 B/op 18 allocs/op
BenchmarkToPBMarshal_1000_Director-2 3000 519368 ns/op 211530 B/op 23 allocs/op
BenchmarkToPBUnmarshal_10_Actor-2 300000 4181 ns/op 976 B/op 24 allocs/op
BenchmarkToPBUnmarshal_10_Director-2 200000 6286 ns/op 1416 B/op 36 allocs/op
BenchmarkToPBUnmarshal_100_Actor-2 30000 41495 ns/op 10336 B/op 238 allocs/op
BenchmarkToPBUnmarshal_100_Director-2 20000 65949 ns/op 14352 B/op 387 allocs/op
BenchmarkToPBUnmarshal_1000_Actor-2 5000 276224 ns/op 71504 B/op 1591 allocs/op
BenchmarkToPBUnmarshal_1000_Director-2 2000 951278 ns/op 200146 B/op 5523 allocs/op
On the branch with gogoprotobuf change:
BenchmarkToPBMarshal_10_Actor-2 2000000 704 ns/op 224 B/op 1 allocs/op
BenchmarkToPBMarshal_10_Director-2 1000000 1145 ns/op 352 B/op 1 allocs/op
BenchmarkToPBMarshal_100_Actor-2 200000 7221 ns/op 2560 B/op 1 allocs/op
BenchmarkToPBMarshal_100_Director-2 100000 13138 ns/op 4096 B/op 1 allocs/op
BenchmarkToPBMarshal_1000_Actor-2 30000 47879 ns/op 16640 B/op 1 allocs/op
BenchmarkToPBMarshal_1000_Director-2 10000 184126 ns/op 57344 B/op 1 allocs/op
BenchmarkToPBUnmarshal_10_Actor-2 500000 2553 ns/op 768 B/op 23 allocs/op
BenchmarkToPBUnmarshal_10_Director-2 300000 3929 ns/op 1208 B/op 35 allocs/op
BenchmarkToPBUnmarshal_100_Actor-2 50000 26547 ns/op 10128 B/op 237 allocs/op
BenchmarkToPBUnmarshal_100_Director-2 30000 44530 ns/op 14144 B/op 386 allocs/op
BenchmarkToPBUnmarshal_1000_Actor-2 10000 180549 ns/op 71296 B/op 1590 allocs/op
BenchmarkToPBUnmarshal_1000_Director-2 2000 643745 ns/op 202258 B/op 5522 allocs/op
There is almost a three to four fold speedup in case of Marshalling and some improvement in Unmarshalling!