xterm scrolling speed - scheduling weirdness in 2.6 ?!

Hi. I've seen this too. It happens when I run ls -al or ls -alR on an uncached directory (usually after boot). If the directory is big, I wait 3-4 seconds for a listing. I've updated bash with yum (currently I'm using bash 2.05b on Fedora with 2.6.1-pre1). It probably doesn't help that my drives are slow (5400 rpm). Doing regression performance testing on the drives using hdparm helps, but the problem still exists.