Using a Real time update on a web app will that crash the server?

I have an app that consist of two types of users one type can post questions and the other type can answer now I'm integrating a real time updates when a user add a question all the other users get this question immediately without refreshing the page I using Pusher for that and once a user adds a question I send an alert to all the connect users nad once they receive this alert they make an ajax requests and get all the question again, my question is , is this a valid way to do that and can this method cause problems later on when deploy app to the server as you can see when I send the alert all the users will make an ajax request to the server at the same time will that cause my server to crash please help me thanks.