I do notice that Auctiva runs real slow for me using IE but works great in FF. What browser are you using?
The reason why you might have to clear cache so often is because you use Auctiva more then other sites plus you might not be getting all of it gone. There is a cache overflow that you have to manually remove if you let it get to this point.
Have you tried PC PitStop? Run their tests, the site is free and very informative.
I used to have problems over yonder until I fixed my overflow and tweaked a few settings and then I never had problems again. Worth a try
