I think I'll agree with Krick. I tested my old PC on the site www.SystemRequirementsLab.com (which compares your PC with the Blizzard's official requirement-info) and my PC was as far to the right of the scale as it could possibly be (which means that it was top-notch compared to Blizzard's recommended requirements). However, in the actual game, I still had relatively low fps and in "stressed situations" (raiding!) it was probably about 10-20 and could easily go below 10.My new PC is slightly better, but my fps is still fighting to stay above 30 most of the time, and I'm beginning to put my video-effects to "Lowest" when raiding.

I'm tempted to say that Blizzard's current recommended requirements should be changed to the minimum requirements! But of course, I suppose that they are simply assuming that a PC that can give you a decent amount of fps while standing in Desolace lives up to the requirements. If they had more realistic requirements, I suppose that they would get less customers, as people with mediocre PCs would be afraid to buy the game.

So if the game is getting better graphics, I think they should reduce the current system-requirements in some way. I previously read a comment on this site which argued that the current game-world is not build in a very "system-friendly" way - I believe his argument was that buildings and locations in WoW could have been designed in a way that wouldn't require so much from PCs and that other games used this technology. Another comment argued that the lag in Wintergrasp could be reduced by giving each class a default gear-look in the zone (because you probably don't care if the player you're fighting has Season 7 or Tier 7, at least not in a massive battle). Those, or similar ideas, seems like possibilities to reduce the current system-requirements and still improve the game-graphics.