Try to avoid the NanNew calls

[shama]

To make this faster, I would get rid of the calls to NanNew, which appears to be newing up strings so that it can pass a string like "change", "new" or delete to the listener. Newing up a string per event seems like a lot of overhead to me. I would instead pass back an enum or in other words, an integer (1=="change", 2="new", etc). Then, you don't have to new an object on the heap for every callback you need to make.

Thanks @Taytay for the tip :)