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Laptop lags when pressing Ctrl-Alt-Del

We are currently in the middle of a Windows 7 migration, and we've encountered a strange issue with some of our laptops. When you press control-alt-delete there can be a lag, sometimes small (5-10 seconds) sometimes large (20-30 seconds). Any ideas what might be causing this?

Were are running:
Windows 7 Professional, latest patches
Server 2008 R2
Variety of hardware, HP desktops and laptops, Lenovo Laptops.
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ISInfrastructure
Asked:
ISInfrastructure
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1 Solution
 
xmlmagicianCommented:
can you do me a favour and change your packet size on your network card to 1250 so that is MTU=1250. use http://www.speedguide.net/downloads.php

let us know how it turns out
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McKnifeCommented:
Hi.
Could it be that laptops feature some sort of biometrics like a fingerprint scanner? If yes, it could be a fingerprint software that needs initialization each ctrl-alt-del. For a test, uninstall that software and restart.
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McKnifeCommented:
Any feedback?
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xmlmagicianCommented:
no news good news i think :-).
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ISInfrastructureAuthor Commented:
Sorry for the delayed response, changing the MTU size worked like a charm. The laptops now log in straight away every time.
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McKnifeCommented:
@xmlmagician
Hi. I never knew there's a connection between ctrl-alt-del (which is pre-logon/pre-unlock) and the MTU size. Can you explain how those interact, please?
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