Finally *tested* effect of fg and bg yield values (and changed them:-)

Mac/Lib/test/fgbgtimetest.py

+"""fgbgtest - See how many CPU cycles we get"""
+
+import time
+
+loopct = 0L
+oldloopct = 0L
+oldt = time.time()
+
+while 1:
+	t = time.time()
+	if t - oldt >= 1:
+		if oldloopct:
+			print loopct-oldloopct,'in one second'
+		oldloopct = loopct
+		oldt = time.time()
+	loopct = loopct + 1
+