What is the potential issue with using a refresh header to update content on a webpage every 3 seconds?

The potential issue with using a refresh header to update content on a webpage every 3 seconds is that it can cause unnecessary server load and bandwidth usage. A more efficient approach would be to use AJAX to make asynchronous requests to update specific parts of the webpage without refreshing the entire page. 

<?php
header("Refresh: 3; url=yourpage.php");
?>

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refresh header webpage content update every 3 seconds potential issue

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