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PAC/WPAD with Iceweasel is horribly slow

When testing the Debian Edu/Squeeze desktop, I notice the browser is
horribly slow.  This is caused by our use of automatic proxy
configuration (PAC/WPAD).  See
<URL: https://bugzilla.mozilla.org/show_bug.cgi?id=235853 > for the
upstream bug report.

By moving away /etc/debian-edu/www/wpad.dat on the main server, the
browser stop using the squid proxy and become responsive.  The problem
is with DNS lookups and wpad handling in Firefox, which block the
entire browser.

A workaround to get faster browser experience would be to switch back
to non-wpad proxy configuration, but this will break the nice feature
of roaming workstations that they also work outside the Debian Edu
network, unless we find a workaround for that problem.

Anyone got a better idea?
Happy hacking
Petter Reinholdtsen

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