12x performance difference between windows and linux

[Benito Canfora]

Please confirm the following:

• I have read the README entirely
• I have verified in the issues that my problem hasn't already been resolved

Setup

Please provide the following details, the more info you can provide the
better.

• Operating System: Win Server 2008 (ram4/cores4) | Win Server 2019 (ram32/cores8) | Oracle Linux 8 (ram2/cores4)
• PHP Version: 7.4.13 | 7.4.13 | 7.2.24
• web-push-php Version: 7.0

Please check that you have installed and enabled these PHP extensions :

• curl
• gmp
• mbstring
• openssl

Please select any browsers that you are experiencing problems with:
Please specify the versions (i.e. Chrome Beta, Firefox Beta etc).

Problem

This is my code:

`<?php
require_once("vendor/autoload.php");
use Minishlink\WebPush\Subscription;
use Minishlink\WebPush\WebPush;

$endpoint = "";
$publicKey = "";
$privateKey = "";

$subscription = Subscription::create(json_decode($endpoint, true));
$auth = [
"VAPID" => [
"subject" => "mailto:[e-mail]", // can be a mailto: or your website address
"publicKey" => $publicKey, // (recommended) uncompressed public key P-256 encoded in Base64-URL
"privateKey" => $privateKey, // (recommended) in fact the secret multiplier of the private key encoded in Base64-URL
//"pemFile" => "private_key.pem", // if you have a PEM file and can link to it on your filesystem
],
];
$temp = new StdClass();
$temp->title = "Notifica da PHP";
$temp->body = "Questo testo arriva dal server";
$temp->url = "/";

$payload = json_encode($temp);
$webPush = new WebPush($auth);
$start_time = microtime(true);
$report = $webPush->sendOneNotification($subscription, $payload, ["TTL" => 5000]);
$end_time = microtime(true);
$elapsed_time = $end_time - $start_time;
echo "Tempo trascorso: " . number_format($elapsed_time, 4) . " secondi";
print_r($report->isSuccess() ? "SUCCESS" : "FAILED");
print_r($report->getReason());`

Sending the notification takes 12 seconds on the old windows server, 6 seconds on the new windows server and 0.5 on linux. Is this expected/normal? Is there anything I can do to improve this/am I doing something wrong?

Expected

A gap less big.

Features Used

• VAPID Support
• Sending with Payload

Example / Reproduce Case

Aformentioned.

Other

[Louis Lagrange]

Hello, performance can be optimized with the extensions bcmath and gmp. Otherwise, most of the work is done by openssl.