I don't think this is a significant issue because it's a one time cost. It could be done at browser startup. Even for a cold start, Hotspot and V8 are comparabl

I don't think this is a significant issue because it's a one time cost. It could be done at browser startup. Even for a cold start, Hotspot and V8 are comparable. $ time java com.Hello real 0m0.096s user 0m0.103s sys 0m0.013s $ time node /tmp/hello.js real 0m0.073s user 0m0.067s sys 0m0.007s