Tips for improving performance with ng-repeat directive?

I have encountered some performance issues while using socket.io with the ng-repeat directive in Angular. The application slows down significantly when receiving a large amount of data from the backend, making it impossible to interact with the app. What would be the most effective way to handle a large list using ng-repeat, with an assumption of receiving 1000 messages per minute?

ctrl.js


$scope.messages = [];
socket.on('ditConsumer', function(data) {
    var obj = {
        file: $scope.filename,
        data: data
    }
    $scope.messages.push(data);
}

main.html

<ul style="list-style: none;">
    <li ng-repeat="message in messages track by $index" ng-class="{lastItem: $last}"><span><strong>Log:</strong></span><span>{{message}}</span></li>
</ul>

Answer №1

One effective way to enhance performance is by using a message id in

ng-repeat="message in event track by $index"
instead of $index, which gets rendered during each ng-repeat digest. For more details, check out this resource.

Another tip is to limit the number of visual items with the limitTo filter:

ng-repeat="message in event track by message.id | limitTo:100"

Even though the hidden items remain searchable and retrievable through other filters, they will not be displayed in HTML.

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