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I thought the move to GEGL the Gimp undertook was supposed to boost its performance, so i'm wondering why is it that slow ?
As i wrote i too believe that the preview on canvas can not be a replacement for normal preview , because so slow
BUT on the other hand you should consider that apply a perfect preview on canvas take exactly same calculation then render the filter.
In my example is true that C2G preview on canvas may took ages, but is also true that after the preview , you will not have to wait for the filter to render
in other words as example now "X" filter normal preview require 5 seconds,but apply the filter 1 minute
On canvas preview instead will require 1 minute , but after that no waiting time for its application ... in theory even 5 seconds quicker!
Alas not in practice because the function of the preview is mainly that to quickly show the effect of different settings to allow to chose the best , maybe even at 100% zoom but allowing to chose only a little area to make preview faster
while "preview on canvas" seems no much better, as time needed , then blindly apply filter without preview and then undo if not happy, try again and so on , and on