I posted a message to b.p.interbase.general last day
(See thread: Weird foreign key performance problem)

I am not sure, but I think it should also be posted at some more FB specific
group, because same problems encountered with FB 1.
Is this the right place? I couldn't find anything more FB specific.

So as a summary: after connection is established the first time
a select is prepared, FB1/IB6 needs several seconds (1.6 to 6.0 s)
to return. And it's not a very complicated command:

SELECT ID FROM SomeTable

More on that in b.p.i.g

--Heiko