It's not optimized at all either. I was realizing that while browsing the web on my battery that all these damn Flash-based ads are killing my battery. Why does this stupid 468x60 ad need so much of my processing power!? It's because the Flash developers are completely inept at making Flash hardware-friendly.
Installing a good adblock program for firefox or safari will take care of that, or flashblock for firefox, or by turning off flash alltogether. I haven't seen a flash based ad in years.
I'm hoping that the future for online video will be HTML5 and free and open codecs, but I'm not holding my breath.