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Sometimes even a simple
grep -l "191684520" */2013/*/*
works.

If there is any chance that any filenames in your file hierarchy contain whitespace characters (space, tab, or newline), xargs won't work. Even in cases where it will work, using it is usually...

You need -r because you are telling find to find directories, and only directories, via -type d.

As for speeding it up it is quite possibly running at maximum speed already -- there's no...