I've noticed that there is a reasonable number of questions that are posed in the format "Does doing X this way perform faster than doing X that way?". Sometimes these questions are popular, and sometimes these questions attract some inflammatory comments or are even closed.
My understanding of the FAQ is that these questions are perfectly acceptable, especially if the question can be answered objectively with comparative references. But I've seen a few questions like this deleted or closed recently. So how should these questions be dealt with?