The JVM is indeed great in many ways. The main issues with it today, I would say, are * Patent and copyright issues - the lawsuit with Google is still going on

The JVM is indeed great in many ways. The main issues with it today, I would say, are * Patent and copyright issues - the lawsuit with Google is still going on, last I heard. * There used to be serious technical issues with startup speed. People saw websites with Java applets and saw how slow they were to load. If that hasn't been fixed, it's a serious problem, as websites do need to load fast, unlike typical Java applications. edit: * A big use case is compiled C++ code. I am aware of lots of languages compiling to the JVM, but I actually don't think I heard of C and C++. Is there such an option? If such an option doesn't exist, or exists but runs more slowly than asm.js currently does (which is pretty close to native already), it would be a problem.