Copy/move speed slower than manual drag&drop

Hello!
I have a simple rule where I move files from int. to ext. drives based on Finder tags.
From SSD to SSD, int. to ext. or ext. to int., The Hazel rule moves files at a rate of 220Mbytes/sec.
When performing the same operation with a manual drag & drop under the Finder, I get the expected speeds of 380-400Mbytes/sec.
Any clue as to why this slowing down happens?
Thanks
I have a simple rule where I move files from int. to ext. drives based on Finder tags.
From SSD to SSD, int. to ext. or ext. to int., The Hazel rule moves files at a rate of 220Mbytes/sec.
When performing the same operation with a manual drag & drop under the Finder, I get the expected speeds of 380-400Mbytes/sec.
Any clue as to why this slowing down happens?
Thanks