1.87mb is the size of the encoded protobuf. Almost certainly, it is being sent over a compressed connection, and I bet there is a lot of easily compressible str

1.87mb is the size of the encoded protobuf. Almost certainly, it is being sent over a compressed connection, and I bet there is a lot of easily compressible string data in there, so the size over the wire is probably closer to 500k(just guessing).