Well, EVERYTHING that is running takes up some resource, like memory, so
it has the potential of reducing performance. The "Fast User Switching
Compatibility" service has to consume some memory (run services.msc to
see it). How fast is the fastest bodily function you can produce? Oh,
too long, a thousand times slower. The question is not whether or not
there is *some* minimally measurable impact but whether or not YOU will
ever notice it.
I don't like the Fisher-Price Welcome Screen (since it gives away half
of the login by revealing usernames). Fast switching is stupid because
you end up with a slower responsding system when trying to run multiple
users on the same hardware (and many applications still don't know how
to handle it), but Microsoft had to add some gimmicks to qualify getting
users to purchase a "new" version. And I don't want to use one login
interface at home (in a workgroup) and another at work (in a domain);
the Welcome Screen and Fast User Switching are not available when you
log into a domain.
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