I am a profesional turner and have built my own CNC to do columns up to 24" by 10'. The only way to beat that speed would be to go with 100K+ machine. Instead concetrate on improving your turning. Go with a single point spur drive, see http://www.turningaround.org/204SpurDrive.htm, turn at max speed and use a skew. I can do a 1.25" by 18" dowel in 4 minutes with tolerances of .01" out of fir. Don't be gentle, get aggesive!