But that wouldn't be a true statement. Google's engineers didn't laugh at Node.js for using V8 due to arrogance. V8 is limited to a single CPU thread per instance. It's great for I/O and a typical webpage, but a CPU task stops everything. PyPy with STM does not have this limitation. Once this project is out of beta, V8 wouldn't compare to PyPy/STM. A better comparison would be the JVM or CLR.