How to load images from server to tableView efficiently?
<p>I have a table view with all cells having the UITableViewCellStyleSubtitle,
the images of all the cells are got from the server.</p>

<p>However, those images are not changed frequently. </p>

<p>Someone can show me how to improve the user experience? Each time, user scroll down the table, it seems that it goes online to check and download images again.</p>

<p>Or at least, show me some options that are available to achieve the goal.</p>

<p>Thanks,</p>
