Yo, what up dizzle,
No there's no built-in way to get the frame-rate reading. Here's a sample script that manually calculates the framerate:
	Code:
	import viz
import time
viz.go()
HISTORY_SIZE = 30
framerate = []
def mytimer(num):
	framerate.append(time.clock())
	if len(framerate) > HISTORY_SIZE:
		del framerate[0]
	rate = len(framerate) / (framerate[-1] - framerate[0])
viz.callback(viz.TIMER_EVENT,mytimer)
viz.starttimer(0,0.001,viz.FOREVER)
 word