I would frankly say that this sort of question is very un-likely to ever be “a legitimate cause of concern.” If you are presented with a known, measurable problem that is actually causing pain to the client's business, then you might consider doing something about it ... and that “something” will probably consist of buying newer, faster hardware. From a software point of view, the key elements should be simplicity and clarity of expression. This really is a case where, “unless it's really hollering, don't give it any medicine.”