PHP If the number of an element was more than an amount, separate elements into two or more pages

Question

I have piece of php code that gets and displays the data saved in a mysql table in separate elements. But my problem is that when the number of elements is bigger than an amount, the page becomes too slow when scrolling so I want to separate these elements into two or more pages to prevent the page to become slow. What should I do?

Here's is a piece of my code :

<?php
$serverName = "localhost";
$username = "User";
$password = "Password";
$database = "db";

$conn = new mysqli($serverName, $username, $password, $database);
if ($conn->connect_error) {
 echo "Failed to connect to the server";
}

$sql = "SELECT row_1, row_2, row_3 FROM table";
$result = $conn->query($sql);

if ($result->num_rows > 0) {
 while($row = $result->fetch_assoc()) {
  echo "<tag>" . $row["row_1"] . ", " . $row["row_2"] . ", " . $row["row_3"] . "</tag>";
 }
}
?>

If anyone knows the way to do that, please reply me. Thanks