Storage migration is unreasonably slow for worlds with a lot of files

### Spark Profile Not possible to spark this early on, visual vm screenshot below ### Description of issue For a world that is 500gb for example world migration just takes so long <img width="1533" height="525" alt="Image" src="https://github.com/user-attachments/assets/f952e610-f124-4e6a-8418-71daafcf14ef" /> shouldn't it just be renaming a few folders? ### Plugin and Datapack List N/A ### Server config files N/A ### Paper version 26.1.2 76d2ac758cb3abe75aceefa88207443768f585c6 ### Other _No response_