I agree that this the last thing I would check. An application can work perfectly find with some functions not optimized. In fact, I have find unoptimized funct

I agree that this the last thing I would check. An application can work perfectly find with some functions not optimized. In fact, I have find unoptimized functions in node.js itself last week in the streams abstractions. Regarding performance of node.js applications I often find myself looking at my cpu profiles and memory dumps in node-inspector because the most common problems are eventloop starvation, memory leaks or long GC pauses.