AngularJS ng-repeat:: - double colon

I was struggled with ng-repeat performance when using multi-select. If the items is large, let’s say, over 2000, the angular-multi-select stuck there coz of to create new scope and individual-item-$watch processing.

I used service-cache, indexeddb, typeAhead, removing ng-bind-html, $sce to try to speed-up the rendering, but effects are not good. Finally I found the solution is to make item readonly, to prevent item-$watch in ng-repeat.

<ul>
    <li ng-repeat="item in ::items">{{::item.name}}</li>
</ul>

double colon(::) is important here to prevent Angular to watch(item, callback) for each item when create new scope. There is an option bindonce, I will use in the future, probably.