I don't see emails like this everyday.
An email with the subject line "CVS is very fast today" gets our immediate attention.
Over the weekend we changed a few mounts on our NFS servers to spread the load a bit better, and to more closely match our classes of service. As a result, our primary NFS server, which serves files for committer CVS, SVN, Git, and other has-to-be-fast content has seen a drastic reduction in disk load.
Committers should expect drastic improvements in performance to their favourite code repos.