Problem AutoCompleteExtender to Phone 8

Hi, my asp.net page is used Ajax Toolkit components. The site is an Ajax Toolkit's ToolkitScriptManager (version 4.1.7.1005). Page textbox in is extenter: AutoCompleteExtender (version 4.1.7.1005). The site works like IE 8 to 11 ok, but Windows Phone 8 WebBrowser slowly. The site is an IIS server.
Is AutoCompleteExtender replacement / better way to do a search function?