At 10% it's approximately the same. But say 50% instead. If it takes 1/2 the time to do something, you can do double the work in that time. If on the other ha

At 10% it's approximately the same. But say 50% instead. If it takes 1/2 the time to do something, you can do double the work in that time. If on the other hand, you can do 1.5x the work in the same time, it means you've made it use 33% less time than before. With 10% less time you're taking 1/0.9 = 1.11111x more work in the same time.