More speed counting rows

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Hello,

I am trying to optimize the count of files when I am using filters
(select by some row/s parameter/s)

In this case I think that postgresql really count all files.
Resulting in unacceptable times of 4 seconds in http server response.
Triggers+store in this case do not see very acceptable, because I need
store 1.5 millions of counting possibilities.

My question is:
Any method for indirect count like ordered indexes + quadratic count?
Any module?
Any suggestion?

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