Here is the last HD theater sign I made for my son. The material is 1/2" MDF, no roughing toolpath, finishing toolpath was done using 1/8" taper ball nose, 14,000 RPM and 400 in/min feed rate .... yes 400 in/min.
http://www.youtube.com/watch?v=hLLc1vwxO9Y
Mick