The instant search operates in the same thread as the one that accepts characters into the search box. Please either add an option to turn off instant search (respond only to "enter" keypress, and/or a mouse click on the magnifying glass icon), or move the "search and render" method to a separate thread so that the user can keep typing. A third option would be to wait for some period of time before kicking off instant search, e.g. 0.5 seconds, 1 second.

I have a large collection, so when I type in the search box, the UI becomes unresponsive for 5-10 seconds after each character is entered.