From Wikipedia, http://en.wikipedia.org/wiki/Microsoft_Java_Virtual_Machine

> It was the fastest Windows-based implementation of a Java virtual machine for the first two years after its release.[1] Sun Microsystems, the creator of Java, sued Microsoft in October 1997 for incompletely implementing the Java 1.1 standard.[2]

Which is the fastest JVM after 1997 is essentially a moot point after the lawsuit was filed.

I also like how Apple completely sidestepped such kinds of situations in iOS by disallowing third party SDKs and alternate browser engines. If there can be no Netscape or Java, there is no threat and no need to kill something and potentially get into trouble. Same with Google and Chromebooks.