Autocomplete search slow when first time search

[宏吉]

if has a lot of data when first time type to search is very slow ,but after will quickly more

how to fix it?

and can I no mater how many results just show only 20 results

[Ivan Danchev]

Hello Hung-Chi,

In scenarios, which involve loading large data into the AutoComplete (or any of the other dropdown widgets: DropDownList, ComboBox, MultiSelect) we recommend enabling the virtualization functionality. See this demo which showcases this AutoComplete feature. This documentation article extensively explains how to enable and configure the Virtualization functionality for the dropdown widgets (the AutoComplete including). 

Regards,
Ivan Danchev
Progress Telerik