What are the potential drawbacks of using the sleep() function in PHP for delaying password entry?

Using the sleep() function in PHP for delaying password entry can potentially slow down the entire application, leading to a poor user experience. A better approach would be to implement a delay on the client-side using JavaScript, which would not affect the overall performance of the application. 

// Implementing a delay for password entry on the client-side using JavaScript
<script>
    document.getElementById('password').addEventListener('input', function() {
        setTimeout(function() {
            // Add your password validation logic here
        }, 1000); // Delay password validation by 1 second
    });
</script>

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