We talked about profiling in Chapter 8, Testing, Profiling, and Dealing with Exceptions, and I'm only mentioning it here because profiling can sometimes explain weird errors that are due to a component being too slow. Especially when networking is involved, having an idea of the timings and latencies your application has to go through is very important in order to understand what may be going on when problems arise, therefore I suggest you get acquainted with profiling techniques and also for a troubleshooting perspective.