This report summarizes the results of laboratory tests, conducted during the period April 1/03 to March 31/04, that were designed to assist mills in implementing super-critical speed sawing. The general characteristics of saw behaviour in the super-critical speed region is discussed and measured saw deviations are presented that illustrate the effect on cutting accuracy of increasing saw and feed speeds. Results are presented for guided spline-arbor saws with diameters of 17", 19" and 24". In each case it was found that feed speeds currently in use could be increased by increasing blade speed.