I had found some  issues in elgg which eats BANDWIDTH OF A USER unwantedly .. and reduces the loading time of river content.

1. Elgg likes window (The user information(who made likes) are loaded intially when the webpage start to downloaded, it increases the loading time of web content, when loading 100s of river items,   but through jquery if adopt a technique that loads the the popup window and its contents only when a user clickes on "(numberof likes)LIKES" button it reduces the the bandwidth usage of user and provides more flexibility.

2. the above same issue is happening when loading userhover menu of every profile picture.