loadend event fires multiple times when zooming out [on hold]

[المشرف العام]

I'm registering for the loadend event, and have noticed that when I zoom out, it fires multiple times. Zooming in, it only fires once.

Is this the expected behavior, or am I doing something incorrectly? I'm registering for the event as

layer.events.register("loadend", layer, function () { alert(layer.id);});

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