Enhance Python Automation Script

I'm seeking a Python expert to enhance my existing automation script. The current script is used for data processing tasks, but I need improvements in the following areas:

- Speed Optimization: The script needs to run faster. I'm looking for someone who can analyze the current implementation and identify bottlenecks.

- Error Handling Improvements: The script is prone to errors and requires better handling mechanisms especially removing duplicates. I'm looking for a developer who can implement robust error handling to ensure smooth execution and one column upgradation

Ideal Skills and Experience:
- Proficiency in Python, especially in automation and data processing
- Experience with optimizing script performance
- Strong background in error handling and debugging
- Ability to deliver clean, maintainable, and well-documented code

Please provide examples of similar work done and approach to tackle this enhancement.