time cost in each step

test result for picklepot serialization:
InstancePot.addObjectValue:56ms
compress Integer:17ms
Iterator<String> to byte[]:34ms
compress String:9ms
sum 	initSize:3,486,764, serialSize:2,436,348 serialTime:117ms

note:Strings are first converted into byte[], then compressed with LZ4Encoder. Integers are directly compressed with RunLengthEncoder.