Is it normal to lag when your first server visitor connects?

[Setro]

http://forum.blockland.us/index.php?topic=205034.0
Every time I host a server, and the first user on that server connects, I lag, but then the lag goes away.
Then when the next user connects, I have no lag.
Is this normal? Is it writing files or something?

[Ad Bot]

[gr8dayseth]

It does it to me, though idk if it does it to anyone else.

[Greek2me]

Yes, the server is rebuilding its file manifest.

[Setro]

Alright thanks, I trust Greek, he knows a lot. Locking.