New search feature with Normal, Parallel and Full scan mode

Summary:

I am trying to identify the difference between the 3 new search options that came in the update for Transaction Matching. All the 3 options i.e. Normal, Parallel and Full scan mode is giving same results. Is this option only to improve the performance of search or there is a better way to use the same?

Content (required):

While using the search option in Transaction Matching, I cannot find any difference in search when I enable any of the 3 options mentioned above. There is an option available after the update in Application->Configuration->System settings->Transaction matching where I am getting 3 types of search to choose from. No matter which option I select, the results remain the same. So just wanted to understand the use of these different options. As far as I could understand, this is only to improve search performance.