How many times have there been rewrites from C++ to Java that ended up being faster ? A couple of times as far as language implementations go (eg JRuby vs CRub

How many times have there been rewrites from C++ to Java that ended up being faster ? A couple of times as far as language implementations go (eg JRuby vs CRuby, even before the whole Graal/Truffle thing). However, that's a niche thing, and any JVM implementations have yet to replace the standard runtimes. As a rule of thumb, I agree that C++ should generally be considered the 'faster' language.