[Haskell-cafe] Meaning of fizzled sparks?

Hi all, If this code: f5Rslts = map (f5 (n-1) startingMinScore startingMaxScore (otherColor clr) 0) newBoards `using` parList rdeepseq totalMoves = sum $ map snd f5Rslts -- Attempt at parallelization yielded no perf. improvement. is yielding a fizzled spark ratio of about 0.3, does it imply that the sum begins pulling from the list, before the sparks have had a chance to compute the first third of the list elements? Thanks, -db