plain inserts and deletes very slow

Hi folks,

my application reads and writes some table quite often
(multiple times per second). these tables are quite small
(not more than 20 tuples), but the operations take quite a
long time (>300 ms!).

The query operations are just include text matching (=) and
date comparison (<,>).

I wasn't yet able to track down, if all these queries take
sucha long time or just sometimes. When running them manually
or trying explain, evrything's fast. Probably there could be
some side effects with other concurrent quries.

Could anyone give me advice ?

cu
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