clausgc

@takayukister

hi – I use the same basic plugins I do with several other sites – I did find the issue: a script in the header I added some months ago to “use passive listeners to improve scrolling performance”

Below the script:
<script>
(function() {
var supportsPassive = eventListenerOptionsSupported();

if (supportsPassive) {
var addEvent = EventTarget.prototype.addEventListener;
overwriteAddEvent(addEvent);
}

function overwriteAddEvent(superMethod) {
var defaultOptions = {
passive: true,
capture: false
};

EventTarget.prototype.addEventListener = function(type, listener, options) {
var usesListenerOptions = typeof options === ‘object’;
var useCapture = usesListenerOptions ? options.capture : options;

options = usesListenerOptions ? options : {};
options.passive = options.passive !== undefined ? options.passive : defaultOptions.passive;
options.capture = useCapture !== undefined ? useCapture : defaultOptions.capture;

superMethod.call(this, type, listener, options);
};
}

function eventListenerOptionsSupported() {
var supported = false;
try {
var opts = Object.defineProperty({}, ‘passive’, {
get: function() {
supported = true;
}
});
window.addEventListener(“test”, null, opts);
} catch (e) {}

return supported;
}
})();
</script>

Tnx for for a rapid solution.