I should have been more clear: It's my http cache for my crawling jobs. Lots of files in many shapes.

My new setup: gen5 ssd in desktop:

    > time find . -type f | wc -l
    5645741
    ________________________
    Executed in    4.77 secs

    > time find . -type f | wc -l
    2944648
    ________________________
    Executed in   27.53 secs