rules-users - fireAllRules performance

I have several thousand objects that gets inserted into a statefull knowledge
session as show below:
for (Item item : itemList)
{
session.insert(item);
}
session.fireAllRules();
Assuming that all the conditions in the rules only concern with one item at
a time, will there be a big performance difference if I changed the above to
as shown below?
for (Item item : itemList)
{
session.insert(item);
session.fireAllRules();
}

Probably not, work is done on insert not fire. Fire just shows what is
on the agenda.
-Michael
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