Cpu usage in about:blank page

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Hello,

Using xulrunner-1.9.0.2, my small browser was using 0.7% of cpu power
in about:blank page. Using xulrunner-1.9.1, it uses now 2% of cpu in
the same page. It seems that my application spends most of its time in
JS_CallTracer function. I'm testing on linux running on a small
amcc440 ppc cpu. I have no plug-in and no extension installed.

Is there a way to reduce this cpu consumption in about:blank page ?

   Regards

          Patrice
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