sourceFile.move significantly slows down the speed

[shinebayar-g]

Previously, all of my code was in a single directory. I decided to organize them and created multiple sub directories and used sourceFile.move (tried moveImmediately, moveImmediatelySync, moveToDirectory as well).

However, this operation seems really expensive. Without moving source files, ts-morph was taking 5 seconds to complete everything (which involves various property modifications, interface modifications etc).
With moving, it took 10+ minutes to finish. It seems it starts really fast in the beginning, but as time goes on it becomes slower and slower.

Is there any trick that I can use to speed up the process?

Update: It seems it's relatively faster when using tsx (3 minutes). Bun and Deno took 10+ minutes.