Canvas widget getting very slow [again - raw text]

Hi all,

I'm using a Canvas widget to emulate a raster graphics display.
I'm setting pixels by drawing lines of length 1.

Unfortunately the Canvas gets slow exponentially when
a lot of such line items are added. If there are more than
about 8000 it's getting very slow, and above 12000 it's getting
extremely slow...

If I wait until everything's drawn and then delete everything and
draw again, it is a bit faster. Maybe this points to an influence of
some cache.

Does somebody know of a solution to this. Or is there a better
widget to emulate a raster graphics display?

Thanks & kind regards,
Gerhard

P.S.: I sent this already, but it was HTML, which some people don't like
in mails. Sorry.
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