Hi, same "problem" here, eee 701 with ecryptfs:
slow login (~5sec) and same delay on every other operation that involve 
authentication... as sudo.
As described by Dustin, i think problem is cpu related; to test try the 
following:

open 2 terminal (shell)
in the first type "top -d1" to show cpu usage
in the second type "sudo ls" (or any other command to "authenticate" with 
sudo), enter the password and then immediatly switch to the other shell (the 
one with top -d1 running)
you will see that the process sudo is at the top with nearly 100% of cpu usage.

So seems problem is not a bug, but is related to the working mode of
ecryptfs (decrypting wrapped-passphrase file, calculating the fekek and
calculating the signatures)

bye

-- 
pam_encryptfs.so causes authentication to be slow
https://bugs.launchpad.net/bugs/295429
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