Optimize components for large datasets

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

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

**Priority**: Low/Medium

The issue names controllers but no files, tests, or entry points. Start by locating the controller implementation and any existing notification handling, then confirm how large datasets are processed. Done means configurable notifications are supported with documented sensible defaults and the relevant behavior is covered by tests.

Written by the indexing model from the issue text.