You may want to take a look to the video from Chris McCord where he builds a Twitter clone and see how he is appending tweets, instead of triggering a full render of all tweets in the page:
Unfortunately he doesn’t provide the link for a Github repo, but if you take a look to the topic Where is the chirp repo for the real-time Twitter clone in 15 minutes by Chris McCord? you will find several links to different repos and discussion about it.
