Delete massive files and folders older than X days

I am trying to delete a very large number of files at one time. The folder has about 500k files in it. My problem is that I needed to delete 500,000 files and it was taking way too long.

can you help me with any alternate solution?

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We are running commands like the following:

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find /directory/ -mindepth 1 -mtime +10 -empty -delete