Developer Question: Can I safely remove jquery-ui.custom.min.js?

I'm curious is this used in the front end for the customer? As far as I can tell it might only be

used when in design mode. Its 151kb of overkill if so and i would like to remove it from my front

end template.

Also… is there any other javascript or css files that are only used for Design Mode

that can be removed to help minimize loading time?