Reproduced the lower node 0.11.10 performance on gentoo.
time node core_engine_benchmark.js
as author answered below comment, the performance gain/loss could be from switches hence the combination of latest v8/node
Clearly the blog posting focuses around the second item (as a biggest replacement reasoning) which is available on both new and old v8. I couldn't reproduce the same problem on i.e. spidermonkey cli but it's visible on node 0.10.26 / 0.11.13
Clearly, you don't know what you are talking about. LLVM can beat V8. As far as I understand, he put LLVM frontend intogether to see the results and it's not the part of the project yet.
I don't know the details but in my opinion a deamon thread like with the Java could work. Besides, I don't think V8 specifically designed for the server use.