I am running the command (based on a doctest in graphics.py)

sage: time p = polar_plot(lambda t:
(100/(100+(t-pi/2)^8))*(2-sin(7*t)-cos(30*t)/2), -pi/4, 3*pi/2,
color="red",plot_points=1000)


There is a serious slow-down going on:

sage-5.1: 8.76 s
sage-5.2: 22.56 s
sage-5.3: 22.59 s
sage-5.4: 22.50 s
sage-5.5: 33.32 s

So somewhere in sage-5.2 and in sage-5.5, this slowed down.

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