Stephen Weeks wrote: > > > Are your matrix multiplications on list-based matrices? > > 200x200 arrays (using Array.array) OK - I'm also using lots of arrays for large amounts of data (such as vertex arrays and polygon arrays for polygon meshes). That might explain why my performance increase seems big... BTW - why are you not using Array2? :) Cheers -- http://www.HardcoreProcessing.com