I have been noticing a slow Flash lately, too, at speedtest.net! Even when way beyond the minimum requirements, at least a Pentium 4 2.4 ghz (on another PC I have that can OC to 2.8) I often keep it at 2.4 ghz, because of the heat. The first symptom: The animations of speedtest.net are noticably slow. It did seem to been related to bad performance reports! And I did check for thermal throttling, can't actually find any reason for it to.