Hi, Looking at figure 8.1 in the manual (Speed advantage of Stepfast), why isn't the speed difference more extreme ? If dWorlStep takes m cubed time (m=50 -> 125,000 units) and Stepfast takes m*iter (m=50, iter=20 -> 1000) shouldn't the graph look quite different, rather than Stepfast running at 80% of dWorldStep for m=50, iter=20 ? - Marco Grubert