Using 2.4.1 version of protobuf java. The message structure is flat and has 
a flat structure with 315 fields as in 

option java_package = "......"

option optimize_for = SPEED;

option java_generate_equals_and_hash = true;

message X {

string field1 = 1;
string field2  = 2;


string field315 = 315;

}


Seeing 40-50% degradation in deserialization performance after the fields 
touched around 280 or so. Please suggest how we can optimize this ? Will 
upgrading to 2.5 help or any other way to optimize this ? 

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