> During my development - only single connection to FB Server, I do a
> lots of query. Each query took about 25-30 secs to complete, but CPU
> Utilization only used at around 16% on my six cores computer.
> On Ryzen 7 with 16 threads, I believe CPU utilization for FB is only 6%.
>
> Are there any hints to set Firebird to use more cpu's power?

Each connection does get an single OS-thread only which can use no more
than an single core at the same time. On an 6-core CPU this means an
maximum of 16% utilization for total CPU.

Firebird does not spread an single query onto several cores as e.g.
Oracle can do.