I converted on my Windows Vista SP1 on a Intel Duo at 2,4GHz 8 albums (109 tracks, 8:51:24.253, pop/rock/trance/disco) with foobar2000 v0.9.5.3 and converter commandline -S --noreplaygain -V 0 --vbr-new - %d (or with other V value).

All tracks are FLAC 1.2.1 -8 encoded (avg. bitrate 929 kbps). The time it took converting is copied manually from the foobar2000 converter window when process finished. Allthough there were no other CPU intensive processes and for all conversions the same background processes were running the times obviously should be taken with a small grain of salt.

I wanted to compare the bitrates and encoding speeds with Lame v3.97 and Lame v3.98 (both Windows binaries from RareWares ) for V0..V5 (I actually never go below V4).