The high performance motor will allow the tool to maintain speed under load/in use. The feature is designed to bring the tool back to the selected speed when the accessory meets the material. This will really be most noticeable at the lower and mid-range speeds. It will be undetectable in high speed applications. It is important to consider technique when using any tool that works through speed instead of torque. A tool that works as a result of torque or force is different than a high speed rotary tool. The accessory should never be forced into the material. Consider a less aggressive more frequent pass and at the lower and mid-range speeds, the tool will adjust to come back up to the selected speed.