Furthermore, to illustrate:

There is always a delay!

From when you touch the device → make a gesture (tap/swipe) → the touchscreen detects the touch → the touchscreen (does some processing) → and forwards the data (total >60ms)

→ the central processing unit receives the data → it munches through the data sending it through different channels in the software → the central processing unit induces a response (total >10ms)

→ the response goes to the proper destination (ie screen) → user sees the response happening (total >10ms).

(Grand Total >80ms)