[Bug 113201]

[Nlappala]

Problem exists with large PAC files


Test 1 - Load a dynamic server page on localhost - A PAC file with about 350 hostname resolves. 

Firefox 7.0.1 with the PAC file enabled (Connection Settings -->
Automatic proxy configuration URL): 3.042 s, 2.865 s, 2.892 s, 3.042 s,
3.003 s

Firefox 7.0.1 with no proxy enabled (Connection Settings --> No Proxy):
0.646 s, 0.686 s, 0.588 s, 0.699 s, 0.573 s

Internet Explorer 8 with the PAC file proxy configuration enabled:
almost instant meaning < 1 s (not measured)


Firefox GUI with the tested PAC file enabled is completely frozen while loading the page.


Test 2 - Start Firefox with 20 tabs

Firefox 7.0.1 with the PAC file enabled (Connection Settings --> Automatic proxy configuration URL): 2 minutes 30 seconds
Firefox 7.0.1 with no proxy enabled (Connection Settings --> No Proxy): 30 seconds

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https://bugs.launchpad.net/bugs/113201

Title:
  firefox spends lots of time hung

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