I am looking for free or low-cost component solution for using
Firebird from Delphi.

Until now I used IBX with standard Delphi visual components (e.g. DBGrid).
But, when having large queries, programs may work slower, even stop
responding because dbgrid/TIBQueries are fully populated.
Is there anything I could do to prevent it?

I know I could use my own grids and then use limited select (select
first etc.)... Anything smarter?