Question: If I have say 100 GB of data and one modify links rule. Let's say it takes 1 hour to complete the Modify Links process. If I introduce 3 additional rename rules, will it take 4x as long?

Answer: No. The difference in processing time should be unnoticeable. LinkFixer Advanced applies rename rules to link paths stored in memory. So, it can compare thousands of rename rules to each link in milliseconds. If you have tens of thousands of rename rules, you might notice some difference in processing speed. But, adding 3 (or 30 or 300) rules will make a negligible difference.