I'm currently running the game on an AMD 3800+... Well below the recommended of 5000+. I was worried that it would be really slow and sluggish on my machine if it would even boot at all... Yet I'm running it fine without any hiccups. I just did the tutorial, and it didn't even seem to slow down at all, everything ran smoothly. While I have to keep it on low graphics, let's face it, in this day and age, even low graphics settings look amazing, and are a non-factor.
Mind you, I'm not saying it would have been CD Projekt Red's fault if this hadn't worked. Quite the opposite, I thought I was going to look like a jerk for asking for a game I couldn't even play... And yet here I am, finding I'm able to enjoy it perfectly fine on my budget machine. However, most companies these days just figure that optimization is a waste of time, that technology advances fast enough that it doesn't matter anymore... It's good to see someone actually worries about such instead of using excess as an excuse for wastefulness.