Optimize handlers for large datasets

**Feature request**
It would be great to have serialization for parsers.

**Use case**
Many users need this functionality for production deployments.

**Implementation idea**
Add a new config option `enable_serialization` with default `false`.

Start by locating the parser handlers and existing configuration options, then trace how handlers process large datasets. Check whether parser serialization or related tests already exist. Done means a new enable_serialization option defaults to false and serialization works for the relevant parsers without changing the default behavior.

Written by the indexing model from the issue text.