By having 15000 nodes the sheer amount of HTML that needs to be rendered could trouble slower browsers like IE (especially it older versions). This is even without taking into account all the necessary JavaSctipt and event handlers that need to be attached for the controls to function. This means that this is a general issue with the browser's ability to handle such a huge page. The best approach here is to reduce the page size, as it will 1) yield better performance and 2) provide better usability.
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