[fedora-arm] TrimSlice seems very slow with F18

What it says. I'm doing builds over NFS, which used to work just fine. But I am seeing occasional huge delays and in general very slow performance. There was a bug in the past where the Ethernet powered down, and another where the CPU went into sleep mode to often and took too long to come out of it. I may be misremembering al of this. I do notice that TrimSlice runs much cooler than it used to. I wonder if there's some CPU frequency scaling going on. But it's so hard for me to figure out if anything is really wrong, it just feels awful. Any ideas? Andrew.