From version 201 onwards (201 and 202 for now), xterm isn't usable anymore.
Text scrolling turned awfully slow. This is quite noticeable when trying to
display things like an ls -lR (much slower than before) or using libcaca or
aalib-enabled aplications (like, 1 fps with "cacamoir" when it used to be smooth).
I'm, btw, using Gentoo and this is an Athlon@600Mhz. If I build versions <201,
everything seems smooth and fine again.
X.Org hasn't released a copy of #201 or #202.
This was the only report with this symptom.
I am guessing that it was due to one of the Linux
kernel issues with sched_yield, which was reportedly
resolved a few years ago.
Perhaps this should be closed.
It's been ages and I can't reproduce this anymore.