Instead of preloading all tooltip content, you can use the built-in ASP.NET AJAX mechanism to load it only after the user hovers with the mouse over the trigger element. This is especially useful if you are showing large files in the tooltip (e.g. videos or large images). The load on demand feature will significantly reduce the initial page loading time and will keep the page size smaller.
An alternative load on demand mechanism for retrieving large pieces of information is through web services.
See demo
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