Here is some data on the performance of SqueezeCenter on my fit-PC Slim.
4004 mp3 files
* Look for new & changed music - 1:50
* Clear library and rescan everything - 18:01
3987 flac files
* Clear library and rescan everything - 13:06
Power consumption was peaked at 9 watts during rescans compared to 7 watts for normal operation.
Full cold load^ of the interface - 15 secs
Warm load - 5 secs
^Clear browser cache and restart browser