Fast for large files, but still chokes on large datasets

This app performs better than most of the competition for large source text input. It still beach balls and fails for extremely large datasets. I would really love to see improvements for very large datasets. For example, if I change the search pattern or replace pattern, I have to wait for the current regex to process (can take seconds). Please abort the current operation when the fields are still active.

Skuperuser about RegExRX