My go-to for fast and easy parallelization is xargs -P.

  find a-bunch-of-files | xargs -P 10 do-something-with-a-file

       -P max-procs
       --max-procs=max-procs
              Run up to max-procs processes at a time; the default is 1.
              If max-procs is 0, xargs will run as many processes as
              possible at a time.