i will rewrite my question, as i see the orginial post was not clear.
Sorry by my english.

I have a table with a moderated grow rate (100000 records at month).
Actually have only 100000 records.
That table have ten ids to ten tables, all have foreign keys. the ids
inserted in the main table related to the other tables are not unique.

The performence is terrible,it takes 3 seconds to insert a record. I
need to know what can i be wrong. I try all: async writes, sweep = 0 ,
backup restoring, running server in w2k, linux,nothing works. Im using
FB 1.5.1 and FIB+.

Any help welcomed.

German.