Improve middleware performance

**Description**
Currently parsers lacks proper backup support.

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

**Priority**: Low/Medium

No files or tests are named. Start by locating the parser and middleware entry points, then read how parser state and configuration are currently handled. Define what backup means, the configurable options and sensible defaults, and measure the middleware path to confirm the change improves performance without breaking parsing.

Written by the indexing model from the issue text.