I would also try to change the update interval.
It is also clear that drawing text elements is more expensive than
drawing circles. Rendering text elements, as I understand, is adding
several polygons. After all, with text you are rendering polygons, at
least with SVG fonts. I don't know if Batik uses different methods to
render text that is installed in the system. Also the extra "<g>"
element decreases performance. If you don't really need the g-element
you could omit it.
Maybe the newly introduced "static" patch would help (see
http://issues.apache.org/bugzilla/show_bug.cgi?id=36627) could help as
well? Maybe if you set the static attribute on the background map?
Thomas, any comment on that? I yet have to test the "static" patch.
Didn't have the time so far.
Andreas
Steiner, Dominik wrote:
Hi there my dear friends,
I’m having a performance problem with my batik application. Basically
I’m doing as follows:
1) I’m having a big svg-map file (600KB) which I load one time into my
SVGCanvas
2) I’m displaying around 100 GPS points (which consists of a <g> that
contains a circle- and a text-element) on this map
3) Then at intervals of 500 ms I’m doing an update of the GPS points
4) The CPU is running at around 90% all the time
5) When I just display the GPS points as circles-elements it brings
the CPU down to around 40%
So can it be that just adding an additional text-element can cause
such an decrease in performance? What are the ‘tricks’ that help to
save performance?
Thank you so much for any help and hints…
Dominik Steiner
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Swiss Federal Institute of Technology (ETH)
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