Optimize parsers for large datasets

**Problem**
When working with routes, the error messages could be more descriptive.

**Suggestion**
Improve error handling and add detailed error messages.

**Context**
This would help with debugging and maintenance.

The issue names no files or tests. Start by locating the route parsers and their current error-handling paths, then reproduce the reported errors with a large dataset if possible. Done means route-related failures provide more descriptive messages and the relevant behavior is covered by tests, if the project has them.

Written by the indexing model from the issue text.