Does anybody know of any good articles that discuss the actual performance merits of using npm addons? Aside from raw computation heavy functions (whereby dropping down to C++ would seem to be a good idea a priori), are there are other scenarios where using npm addons is a good idea in the node context?

For example, one thing I have found is that nodejs seems to be horrendously very slow at file system manipulation. Dropping down to a C++ addon thus might be a good idea if you're making a nodejs app that has a lot of file system manipulation involved.