Aside from the huge benefit it gets by being single-threaded, doesn't javascript have a lot of this same baggage? V8 is so much faster than Ruby for certain alg

Aside from the huge benefit it gets by being single-threaded, doesn't javascript have a lot of this same baggage? V8 is so much faster than Ruby for certain algorithms that I would think there still has to be lots of room for optimization if someone poured the money and IQ into it that Google did.