I have experimented with path.simplify and can't see any appreciable
improvements.
Incidently, I also experimented with other back ends. I found that all the
back ends
involving Agg behave similarly. However, using the 'GTK' backend it
renders the
whole 1 million points and does it very fast (about 5x faster than Agg
backends).
I also found that gnuplot can render the whole million points very fast
using the
'x11' terminal. I am guessing that both matplotlib's GTK backend and
gnuplot's
'x11' terminal use the hardware accelerated display driver.
David
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