I believe he is simply just counting his experience while porting GIT to Java. No where did I find that he claims he's an expert. What he did was providing his

I believe he is simply just counting his experience while porting GIT to Java. No where did I find that he claims he's an expert. What he did was providing his experience on the trenches. In case if you are the expert, I would assume that he wouldn't mind if you have any insights to tune in the performance of JGit even further. You can start by joining in the mailing list. He wasn't quantifying anything since he was not answering your question, he was sharing his experience.