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              99% of Windows usability issues would be fixed if Windows had the guts to add this button
 
            
            (media.piefed.social)
          
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Have you tried turning off thumbnails? In my experience when it slows down on large directories like that it's either trying to generate thumbnails or index a bunch of new files (which is also a possibility in your use case)
A great thought on the thumbnails, but the behavior exhibits even when using command-line tools.
Indexing is off for the entire drive, I can't even begin to imagine what kind of mess that would make if it was on.