Improve data performance

**Description**
Currently handlers lacks proper import support.

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

**Priority**: Low/Medium

No files, tests, or entry points are named. Start by locating the handlers and any existing import path, then determine how configurable imports and their defaults should be represented; done means the import behavior is configurable with sensible defaults and the reported data-performance concern is addressed.

Written by the indexing model from the issue text.