We’re optimizing every day (and still have work to do), but we get lots of traffic and perform tons of parallel Web Service calls – the site performs like a beast on WordPress and Amazon EC2.
From http://www.pcmag.com/article2/0,2817,2399365,00.asp, “Top Retail Sites Still Way Too Slow, Study Finds”:
Only eight Web sites finished with an average load time under four seconds: Nike.com (2.269 sec), JCPenney.com (2.65 sec), Amazon.com (2.776 sec), eMusic.com (3.279 sec), eCrater (3.542 sec), WellsFargo.com (3.81 sec) and CDUniverse (3.81 sec).