Hello
This is an interesting problem so I've make a quick scripted test to see
what's happen when there are deep nested "use" elements (see the
attachment).
This use case is a bit different than the Sierpinski carpet's issue but have
similar concern.
This test is a simple loop that produce the following SVG output on each
loop :
<g>
<use xlink:href="#priviousGElement"/>
<rect/>
<text>loop number</text>
</g>
each G element include the previous G element through the USE element
To increase the deep of the test, you just have to change the value of the
JS variable "deep" (for convenient reason, there is also a lineLength
variable to perform some visual line break on the test)
After some quick test, it appear that :
- Firefox 4 (minefield) hang significantly after a deep value of 100 but
is able to render all the elements even with more than 300 nested USE
elements (but it is completely freezed for a loooong time)
- Chrome 9 do not hang but refuse to render more than 146 nested USE
elements
- Opera 11 hang significantly after a deep value of 200 but is able to
render an amazing number of nested USE elements (I've try up to 600) with
acceptable freezing time.
This is definitely not a real world scenario but there is place for
optimization here
Hope that help.
--
Jeremie
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Web : http://jeremie.patonnier.net
Twitter : @JeremiePat <http://twitter.com/JeremiePat>
