I need suggestions to improve speed and usability. I have a RadComboBox with over 700 items. The user needs to be able to select multiple items from the list, so I have checkboxes turned on. However, the combination of checkboxes and a large number of items makes the combobox open and close very slowly. I was told that the usability is not acceptable for the users and I need to make it work faster. I have 5 of these long checkbox lists on the page.

Hi Kim,

Could you specify the version of the controls that you are using as well as the browser. We have made a couple of improvements in terms of performance related to the checkboxes. Another alternative is to use the RadAutoCompleteBox control, which supports multiple section and it's optimized to work with lager amount of data.

Regards,
Dimitar Terziev
Telerik