Adobe Reader 11.0.2 Very very slow

Hi all,
Since I have updated to Adobre reader 11 (11.0.2 or 11.0.3), I have some issues on some computers.
i have 40 computers with the same configuration (Win 7 x64)
For 20 of them, It is very slow to open a document (about 6-7 secondes to open Adobe reader)
the the other 20, no issue (1 second max, to open Adobe)
I have noticed that disabling "protected mode" permits to avoid the issue, but I dont want to disable this important security feature.
Why some of the machines works well and the others do not work well ?
Does that performance issue is a known issue by Adoebe ?
Do you have any link to any Adobe release note dealing with that ?
Do you have a way to fix that issue without redusing security ?
Thank you every body for your help

Hi Pat,
reader_sl.exe is not in the startup list.
Disabling protected mode is a very high security break that i dont want.
Any other idea ? Thank you

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