+.TP 8
+.B \-delay \fImicroseconds\fP
+How long to pause between frames. Default is 20000, or 0.02 second.
+.TP 8
+.B \-fps
+Display a running tally of how many frames per second are being rendered.
+In conjunction with \fB\-delay 0\fP, this can be a useful benchmark of
+your GL performance.