Taking x2 as long as C is a great achievement, especially with Git, which is already extremely fast. But they've done it by optimizing hell out of Java - it's

Taking x2 as long as C is a great achievement, especially with Git, which is already extremely fast. But they've done it by optimizing hell out of Java - it's far from idiomatic java, more like the C-style java you see in the standard Java libraries (but to be fair, C-Git has also had hell optimized out of it).