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jskfanFlag for Cyprus

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Global catalog server benefits

If I understand, Theoretically,  when we have one domain with multiple sites or multiple domain in the same forest with multiple sites, we need to enable global catalog on the domain controller of each site, otherwise the login process of the users at each site will be slower than it is supposed to be.
if that s true, Can someone explain why this would slow the login process ?
Thank you
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does that mean the domain controller on each site without GC would not have enough information to authenticate the user login ?
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it makes sense when there are multiple domains in multiple sites...as Universal groups are involved.
I am not sure when there is one domain and multiple sites, where Universal groups are not needed.
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Any follow up on this ?
when there is one domain and multiple sites, where Universal groups are not needed. how would the non presence of GC on a domain controller at a certain site slow down the login process.
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Thank you