You can try something like that:
Display a loading-gif on your page:
<div class="loading">
<img src="https://stackoverflow.com/questions/27108406/path/to/loading.gif" />
</div>
And then hide it when the page is fully loaded:
$(document).ready(function(){
$('.loading').hide();
});
or hide it when some ajax-calls are completed:
$(document).ajaxComplete(function() {
$('.loading').hide();
});
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solved Busy Indicator while page is loading