> My application has a log file and apparently the difference is not in a
> particular process. It is "spreaded in the time". It seems as if there is a
> configuration (like was the write cache on the disk of the server) that
> makes just everything slower.

Maybe the problem is outside of Firebird and your application: have you considered checking the network: low throughput and/or high latency of the connection could have a big impact on the user experience.
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