Like the comments have mentioned, you really shouldn't be injecting data into the DOM yourself. If you need to change how much data is shown in the DOM, use a filter on your ng-repeat.
Also, 250 items in an ng-repeat shouldn't be enough to slow down a page unless there's some pretty heavy processing occurring on each item. I would suggest using something like Angular Batarang to profile your application to see what's actually causing it to be slow.