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Try disable grub2's graphical mode. Story follows.
Recently I figured I'd reinstall Arch, and I'd go with grub2. You know, why not. I had it set up to load graphically, and to keep the configuration for the kernel. (the default, I believe)
Anyhow, my terminal was exceptionally slow at scrolling. By this, I mean you could run a dmesg, grab a cup of coffee, come back, hit control-c, run dmesg | tail and get the actual info you need. That's how bad it was. If you switched virtual terminals while scrolling and switched back, it would be done.
The problems didn't end in the console. Running X, video was exceptionally slow. I'm not speaking about trying-to-play-a-720p-youtube-video-on-netbook-slow, I'm speaking about a Core i7 not being able to handle a 320p video when scaled to about 800x600. Full screen was even worse - it made slide shows look quick.
I didn't put 2 and 2 together at first - and blamed flash - but then when I tried to play the best music video of all time (The Lonely Island - Jack Sparrow) of which I have a downloaded 1080p copy with MPlayer, it just chocked. I've played the same video countless times on the same system. My original guess was something to do with the kernel. So I grabbed a copy of the 3.0-next sources and compiled away. Rebooting, I found the same problem.
By chance, I decided to go back to grub1, and the problem was gone. Reinstall grub2, problem reappears. Digging in the grub2 config file, I disable gfx mode and rebuild my config. The problem goes away... Reenable it, problem appears again. I can reproduce this 100% reliably... I guess I should look at filing a bug (or, if you already know of one, point me in the right direction)
Hope this helps someone.
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