Am 21.08.2006 um 15:59 schrieb cdrick: > euhh actually, I don't see any primitive call in > Integer>>factorial , only a recursive function... did I miss > somrthing ? No, #factorial is a regular method, but LargeInteger arithmetics is accelerated by LargeIntegerPlugin. You could try [10000 factorial] timeToRun with and without the primitives. - Bert -