javascript click not firing immediately with Hammer.Swipe

[danicomas]

var hammerManager = new Hammer.Manager(document.getElementById("page"));

            var swipeRecognizer = new Hammer.Swipe({
                threshold: 20,
                velocity: 0.01,
                direction: Hammer.DIRECTION_RIGHT,
                time: 3
            });

            hammerManager.add(swipeRecognizer);

            hammerManager.on('swipe', function(ev) {
                if (ev.type == 'swipe') {
                    $("#left-panel").panel( "open");
                    ev.srcEvent.preventDefault();
                    ev.srcEvent.stopPropagation();
                }

            });

<input type="button" value="Populate" onclick="populate()" />

Swipe works good but If I click on the button, don't respond fluent.

Android 4.4.4 Nexus 4