Transaction commits VS Transaction commits (with parallel) VS query mean time

Hi Hackers,

Does increase in Transaction commits per second means good query
performance?
Why I asked this question is, many monitoring tools display that number of
transactions
per second in the dashboard (including pgadmin).

During the testing of bunch of queries with different set of
configurations, I observed that
TPS of some particular configuration has increased compared to default
server configuration, but the overall query execution performance is
decreased after comparing all queries run time.

This is because of larger xact_commit value than default configuration.
With the changed server configuration, that leads to generate more parallel
workers and every parallel worker operation is treated as an extra commit,
because of this reason, the total number of commits increased, but the
overall query performance is decreased.

Is there any relation of transaction commits to performance?

Is there any specific reason to consider the parallel worker activity also
as a transaction commit? Especially in my observation, if we didn't
consider the parallel worker activity as separate commits, the test doesn't
show an increase in transaction commits.

Suggestions?

Regards,
Haribabu Kommi
Fujitsu Australia