How to make menus more responsive in Marlin 1.1.9
Supposedly, it's no longer necessary in a recent Marlin version, already the inline bool handle_adc_keypad() function from ultralcd.cpp has implemented a smaller (100&nbsp;ms) time delay. You could lower the value of #define ADC_MIN_KEY_DELAY 100 to #define ADC_MIN_KEY_DELAY 50 to see if that has any effect.

Also, look for next_button_update_ms = now + 300; (4 instances) which employs a 300&nbsp;ms time delay after buttons are pressed. Try lowering the 300&nbsp;ms time delay.