CPU frequency tuning facilities common in other distros, generally around the keyword “cpufreq”, weren’t working in Fedora 13. The ‘performance’ modules simply were not there in the standard Fedora kernels, though a few others were; but even those were not willing to run. I found this document: http://docs.fedoraproject.org/en-US/Fedora_Draft_Documentation/0.1/pdf/Powe… which led to a very different method. I don’t know some of the details; especially, I don’t know whether it actually uses the cpufreq bits which are still there in stock kernels. But it appears to serve the same function and much better, when checking parameters for CPU, hard drive, and (of course) jackd usage percentage, the advantage was glaring. The command line I used (from root) is: tuned-adm profile latency-performance Shockingly, and most happily, this setting stays put through a reboot, it simply sets a large number of lower-level items to modes for minimum latency and maximum related performance. My jackd percent-usage at rest went from 4% to 0.4%; with all apps fired up, from 15% to 10%. J.E.B.