I get about 6X encoding via Musicmatch 5 on a celery 450 with an Ultraplex drive.
Lame is quite a bit slower, but I use it on albums I really like... =)

Jazz
(List 112, Mk2 12 gig #40. Mk1 4 gig #30. Mk3 1.6 16v)
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Jazz (List 112, Mk2 42 gig #40. Mk1 4 gig #30. Mk3 1.6 16v)