I don't think SPCR is slow to load at all, but I did notice the rating on Alexa and think that the nasty review said something about being slow.
Alexa seems to be a bit "squirrely" about things sometimes. For example sometimes they give us a 1-star average rating and sometimes (right now, for example) they give us a 5-star rating. Sometimes they have a sample page from SPCR available, sometimes (now) they don't. And right now the speed rating says "Average" at 2.3 seconds.
Looking at their 5 top ranked sites right now I see Yahoo avg/3.3, MSN avg/2.1, Google v-fast/0.8, EBay slow/3.4, and Microsoft v-slow/5.7. Looks like today's break between average and slow is 3.3 to 3.4 seconds. Yesterday we SPCR was accused of being slow with a 2.6 second load time, if I remember right.
I'm all in favor of SPCR having sponsors and advertising them as is. I try to patronize our sponsors, and I also encourage the other vendors I patronize (like Newegg) to become SPCR sponsors. If they want to have flash/shockwave/Java/whatever animation in their ads, that's great (as long as nobody thinks that those "vibrating" banners are a good idea.) Though my approval is hardly needed for any of this (except the vibrating banners - that might make me hurt someone.)