Clean me up, Scotty. Project cleaning and organising Tool

What does this do exactly:

  • Find duplicates in your project, relink everythin to only just one single file and delete all the duplicates.

for e.g. I have a texture in the starter pack and the same identical texture (just different file location) in an asset-pack.
what criteria makes it a “duplicate” and which file is deleted, and what references are all changed (e.g. in C++ code, unopened maps) and how long does this take compared to the (slow) mechanics already implemented in UEd (redirectors)?