Why does the waveform respond slowly when adjusting the time base?

In fact, it is not that the waveform responds slowly, but that the waveform is re-collected and refreshed when the time base is adjusted. In the running state, the ZDS2022 oscilloscope will re-collect and refresh the waveform regardless of changing the time base, horizontal displacement or vertical scale. 

Under different time bases, the storage time is different, so the acquisition time is also different. For example, when switching from 500ms/div to 1s/div, the pre-trigger changes from 3.5s to 7s, which means that the pre-trigger needs to store 7s of waveform before it will trigger the acquisition and display. When changing the vertical scale and horizontal displacement, the ZDS2022 oscilloscope also needs to re-acquire the waveform.