[Violation] 'click' handler took 1575ms code example

Example: [Violation] 'requestIdleCallback' handler took ms

<?php
    session_start();
    //echo $_SESSION["current_user"];
    //echo $_COOKIE["current_user"];
    session_destroy();
    unset($_COOKIE["current_user"]);
    setcookie("current_user","",time() -3600, "/","", 0);
    //header("location: login.php");
?>

<!doctype html>

<html>
<head>
</head>
<body>

<script>

    // Default settings
    window.fbAsyncInit = function() {
        FB.init({
            appId      : '<app-id>',
            cookie     : true,
            xfbml      : true,
            version    : 'v2.8'
        });
        FB.AppEvents.logPageView();   
    };

    (function(d, s, id){
        var js, fjs = d.getElementsByTagName(s)[0];
        if (d.getElementById(id)) {return;}
        js = d.createElement(s); js.id = id;
        js.src = "//connect.facebook.net/en_US/sdk.js";
        fjs.parentNode.insertBefore(js, fjs);
    }(document, 'script', 'facebook-jssdk'));

    window.onload = function(){
        logout();
    }
    function logout(){
        console.log("1");
        FB.getLoginStatus(function(response) {
        if (response.status === 'connected') {
            FB.logout();
            console.log("2");
            window.location="login.php";
            console.log("3");
        }
        else{
            console.log("4");
            window.location="login.php";
            console.log("5");
        }
        });
    }
</script>
</body>
</html>

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