This is pretty much the right place, as far as I can tell (sometimes people ask in the Questions forum, sometimes here - don't think it matters much)
re "perf expert" - there's a few posters here who do performance calculations for a living, and are far better qualified than me to explain it. One of them will no doubt wander by in due course. (I'm just hoping after my appalling track record of technical explanations over the last week or so that I haven't screwed this one up too)