SVG printing performance

Hi everyone! :-)


A few days ago, I tried printing the "SVG Parameters 1.0, Part 1:
Primer" [1] in Firefox stable [2] and it just appeared to freeze so I
killed it after a couple of minutes. Today, I got back at the subject
with a few more spare minutes and started by trying Firefox nightly
[3] (which, by chance, gave slightly better results). :-)

Given that document holds a couple of complex SVG files (World maps)
and that the "examples are emulated by a Javascript prototype" [1],
this seemed to be the proper place to start digging on this...


Steps to reproduce:
1. Go to "SVG Parameters 1.0, Part 1: Primer" [1];
2. Choose "File", "Print...";
3. Set up printer preferences (if any) and press OK.

Expected result:
The document would be printed within a reasonable time.

Actual result:
An apparent freeze occurs at 63%. While Firefox nightly takes a couple
of minutes to unleash and slowly proceed, Firefox stable takes more
than 10 minutes!...

Additional information:
Few environment details:
 * Operating system is Windows XP SP3;
 * Hardware consists of a Pentium IV 3.0GHz with 2GB of RAM;
 * Graphics adapter is an ASUS A9250 (ATI Radeon based).

Call stack of the thread which takes the CPU:
 ntoskrnl.exe+0x584d
 ntoskrnl.exe!IoPageRead+0xae0
 hal.dll+0x2ef2
 xul.dll!NS_InvokeByIndex_P+0x42749


I'm not sure if I should start by reducing this issue first but, given
the amount of TODO items involving bug reduction in my stack, I felt
like it was a good idea to create a thread on this first and move it
to Bugzilla if this is seen as a bug and, at the same time, act as a
reminder for whenever I have the chance to get back at this. :-)


Regards,
 Helder


[1] http://www.w3.org/TR/2009/WD-SVGParamPrimer-20090616/
[2] Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.0.11) Gecko/
2009060215 Firefox/3.0.11 (.NET CLR 3.5.30729)
[3] Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2a1pre)
Gecko/20090622 Minefield/3.6a1pre (.NET CLR 3.5.30729)