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From a technical point of view, throttle response can be measured by how fast your engine can build vacuum in its intake manifold, via throttle pressure. The faster and higher peak vacuum is reached in the intake manifold, the higher the pressure differential will be between outside air, and your engine.
This pressure differential forces the air to flow from the area of high pressure (outside air) to the area of low pressure (the engine and pneumatic cylinders), and the higher the pressure difference, the greater the pressure force, and the faster the air flow into the engine. This is essentially how throttle response works. To improve throttle response several engine alterations can be used to achieve a higher peak vacuum in the engine or a faster change in vacuum per throttle input…
some of these include:
1- Using undersized intake pipes and intake plenum runners to increase the airflow velocity in the intake system, making the engine able to suck all the air out of it faster and create vacuum sooner.
2- Adjusting intake cam timing to open the intake valve as peak vacuum is created inside the cylinder near bottom dead center.
3- Reducing the overall intake system volume, by using smaller manifolds, less vacuum lines, and more electrically operated (rather than vacuum operated) engine auxiliaries which means the engine has less air volume to clear from the intake system to create a vacuum in the manifold to force new air in.
4- Using cam separation and cam overlap (when both intake and exhaust valves are open at the same time) to have the previous cycle’s exhaust gasses help pull in fresh intake gasses for the beginning of this combustion cycle. Pneumatic Cylinder, Pneumatic Valve, Air Cylinder, Air Treatment Units, Pneumatic Accessories, Hydraulic Components, Pneumatic Cylinder Manufacturer,  Electric Chain Hoist, One interesting application of this concept is the G-Power supercharger kit for the BMW M3.
The ASA supercharger powered kit focuses on response and efficiency rather than on astonishing peak power figures. The G-Power kit utilizes a very conservative boost supercharger by ASA giving a peak of only 4.4 psi of boost.
Since the engine already very highly powered at 420hp, the addition of just 4.4psi of boost results in well over 500hp (as a conservative estimate) and as much as 560hp as a result of this combination.