Are Java 6's performance improvements in the JDK, JVM, or both?

Question

I\'ve been wondering about the performance improvements touted in Java SE 6 - is it in the compiler or the runtime? Put another way, would a Java 5 application compiled by J

Answer 1

I have not heard about improvements in the compiler, but extensive information has been published on the runtime performance improvements.

Migration guide:

http://java.sun.com/javase/6/webnotes/adoption/adoptionguide.html

Performance whitepaper:

https://www.oracle.com/java/technologies/javase/6performance.html