Spanning tree can slow the network?

[Andrea <an.celli () tiscali it>]

Hello guys,
I've captured network traffic from some customer's LAN for monitor 
behaviour of slow applications, in all cases I've found spanning tree 
packets that slow the transactions, like this:

    Spanning-tree-(for-bridge)  STP  Cost=4  port=0x8003

every time there is a spanning tree packet follow after a pause of time 
(about 1 sec.)  before arrives other data packets, this behaviour I've 
seen either in LAN with many switches and in LAN when switch was only one.

How it is possible? I don't have configure spanning tree on switches. 
Can this be a normal behaviour ?

Thanks
Andrew
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