Anyone else seeing yum running slow in rawhide?

[Bruno Wolff III]

For about the last month or so it seems like yum has been running much 
slower than in the past. Previously I had seen something similar when 
running debug kernels, but that isn't the case now.

I am seeing a lot of time being used for wait, but there is still a lot 
of idle time as well. So I suspect the bottleneck is disk I/O. I am not 
seeing this on an f18 machine that I tested with the current rawhide kernel.
mdadm appears to be the same version on both machines. So it doesn't seem 
likely that an mdadm change was responsible.

Was there any change to yum that would have potentially caused this?