These warnings appear because this type of event listener can potentially cause performance issues - but this doesn’t mean that they are. In our case we cannot use passive event listeners, because we’re conditionally prevent page scroll, and this cannot be done with passive event listeners. E.g. in the case of the listview in the
touchmove event we’re checking if the horizontal movement is larger than a threshold, we start swiping the listview item, and blocking the page scroll.
However in the case of the listview only 2 warnings should appear (for one listview). I guess those few thousend warnings gathered while using the app for a while, including other components. E.g. if you use a rangepicker, it will display ~50 warnings like this, every time it’s opened.
Let me know if this explains!