If you haven't made your mind up wether to download it or not, learn from my mistake and don't! Wait awhile, till Microsoft have brought out some patches, to try and passify the angry, baying mob, hammering at their door.
Before I downloaded it someone on this forum said they already had it and it was really fast. Don't you believe it. It's painfully slow and full of bugs. As soon as I figure out the best way to revert to IE7...IE8 it will be history.
Well prior to installing this yesterday, fresh from a clean install of Windows XP. My PC was performing superbly. Then came IE8 and everything has gone downhill since. When I say everything I of course am refering to IE8
xp home sp3 2meg ram pentium 4 2.8 im finding it very slow like yourself, IE very very slow to load with my home page being google i have a very good adsl download speed so it can't be that like you its very frustrating, not sure if its because its more suited to a core 2 duo & not a single core