"In a plant where required numbers actually dictate production, I like to point out that the slower but consistent tortoise causes less waste and is much more desirable than the speedy hare who races ahead and then stops occasionally to doze. The Toyota production system can be realized only when all the workers become tortoises.
High-performance machines were in demand for a long time before the term "high performance" was thoroughly examined. When we say high performance, we may mean high-precision finishing, low energy consumption, or even high-precision finishing, low energy consumption, or even trouble-free machines. Each can be correct. However, a frequent mistake is to regard high-productivity and high-speed machines as being the same.
If we can raise the speed without lowering the operable rate or shortening the life of the equipment, if a higher speed will not change the manpower requirements or produce more products than we can sell - then we can say high speed means high productivity.
Speed is meaningless without continuity. Just remember the tortoise and the hare. Moreover, we cannot fail to notice that machines not designed for endurance at high speeds will have shortened lifespans if we speed them up."
- —Taiichi Ohno, Toyota Production System, English edition of 1988