Frank Dekervel <[EMAIL PROTECTED]> writes:
> this turns this query in an append of a whole lot of seq scan/ index scan's. 
> These scans are predictably quick, but the "append" takes 5 seconds (and the 
> numbers of the scans do not add up to the append actual time)

It says 5 milliseconds, not 5 seconds.

> Does someone have an explanation / possible solution for this performance ?

Rethink your schema --- this is pushing the inheritance feature far
beyond what it's designed to do.

                        regards, tom lane

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