update: adding the above line does not have anything to do wiith the
problem.

as said by Trond Husoe, the slowness is due to an unclean resolv.conf
when no wired/wireless connection is established. it seems like when
you're launching an application the computer tries to connect to the dns
servers, but it can't, so the connection goes in timeout and the app is
finally started.

the problem is still present when using  wicd to manage the network: in this 
case, however, you just have to click the "Disconnect" button and  resolv.conf 
is cleaned up. Apps launch lag is immediately fixed.
Unfortunately, NM does not have anything similar, just a "Enable wireless" 
button whose effect i ignore.

in the meanwhile, i temporary use a shell script that cleans resolv.conf
every startup, but that's only a workaround. is that right?

another question: can anyone tell me why apps that don't have anything
to do with the network, like gcalctool, are suffering of the problem?

-- 
[/etc/resolv.conf] Extra slow login / app launch
https://bugs.launchpad.net/bugs/78263
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