I don't know about the exact definition of "mainstream bytecode-based VM", but just for the record: both the OCaml interpreter and the GForth interpreter usually score pretty well, too.

Probably the de facto fastest interpreter is the one of the Sun HotSpot Java virtual machines. There is a paper by Robert Griesemer detailing some information, but AFAIR it is a hand-coded optimized assembly interpreter that does not too bad. LuaJIT's interpreter is doing quite well, too. (Mike Pall said in the LTU thread about trace-based compilation that the LuaJIT2 interpreter is mostly on par with the LuaJIT1 compiler, or at least not much slower.)

EDIT: replaced "LuaJIT1 interpreter" with more accurate compiler as pointed out by haberman.