Gave it a go on my good old T2130 laptop (stock 1.86GHz) w/ 2GB PC5300 & 320GB scorpio (5,400rpm).
1) Tron: avg 3.47fps | time 17m28.682s
2) Splice: avg 2.57fps | time 21m33.232s
3) Big Buck Bunny: avg ~3.85fps | ETA >1 hour <-- I didn't wait for it to finish, too obscene a wait
Big problem with handbrake on this CPU, it only seems to use MMX2, it ignored SSE entirely, even though the CPU supports SSE1/2/3. It looks like they're using a primitive whitelist method for checking SIMD support. Hence the big frame processing rate hit.