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Firefox 10+: poor js performances on a html page loaded from filesystem
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willywo...@gmail.com  
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 More options May 30 2012, 4:50 am
Newsgroups: mozilla.dev.tech.js-engine
From: willywo...@gmail.com
Date: Wed, 30 May 2012 01:50:29 -0700 (PDT)
Local: Wed, May 30 2012 4:50 am
Subject: Firefox 10+: poor js performances on a html page loaded from filesystem
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I built a fairly complex javascript framework, based on YUI3, to render Forms in a web page; as I was testing it I got very very disappointed by the speed of execution of this rendering on Firefox 10+; the exact same page on Chrome was running 10x quicker.
Then I tried again, but instead of opening this test page from the filesystem (ie. the address bar showing "file:///..."), I loaded through a local webserver (address bar: "http://....").
To my big surprise and relief, I found the performances on par to Chrome.

Do you guys know if there's a reason for this behaviour? I'm not saying it's a problem, since that javascript will always be served through a web server, but it got me very curious.

Thanks!


 
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Boris Zbarsky  
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 More options May 30 2012, 9:43 am
Newsgroups: mozilla.dev.tech.js-engine
From: Boris Zbarsky <bzbar...@mit.edu>
Date: Wed, 30 May 2012 09:43:27 -0400
Local: Wed, May 30 2012 9:43 am
Subject: Re: Firefox 10+: poor js performances on a html page loaded from filesystem
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On 5/30/12 4:50 AM, willywo...@gmail.com wrote:

> Do you guys know if there's a reason for this behaviour?

Some things have special security checks that only happen in a file://
context.  But past that, it's really hard to say.

If you can put a zip or tarball of the app somewhere so that I could run
it under a profiler, I could give you a better idea of what's going on.

-Boris


 
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