Optimize helpers for large datasets

**Description**
Currently lib lacks proper notifications support.

**Proposed solution**
Add configurable notifications with sensible defaults.

**Priority**: Low/Medium

Start in lib/ and trace the helper paths related to large datasets, along with any existing notification entry points. Before editing, clarify whether the issue targets dataset-helper performance or configurable notifications, since the title and description differ. Done should include agreed defaults and a verifiable behavior or test for the selected scope.

Written by the indexing model from the issue text.