When I get you right, auto proxy recognition can't do without a DNS call.
Reading this, I suggest:
- prevent DNS calls from blocking the GUI
- prevent DNS calls if the proxy string spread via DHCP is an IP (as in my case)
- prevent proxy detection with every URL call; rather define some update 
interval
  or just lookup proxy settings (wpad.dat) on failure.

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

Title:
  firefox spends lots of time hung

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