ASP. NET C# Web Application Performance Issues

I have an ASPX page with 40 ++ Drop Down List in a table generated from back-end C# code as shown: Drop Down Lists

These drop down list can be searchable with the help 3rd party jQuery below:

<script src="../Scripts/jquery-1.8.3.min.js" type="text/javascript" ></script>
<script src="../Scripts/jquery.searchabledropdown-1.0.8.min.js" type="text/javascript"></script>

Everything working fine except when the page is loaded it is very slow which took about 20 to 30 seconds.

Any advice guys? Is there any other way around or other better recommendation on the wild search?

Thanks...