从url获取数据的最快方法

Question

我想从Linkedin URL读取数据，例如https://www.linkedin.com/countserv/count/share?url=https://stackoverflow.com/&format=json

我有几种方法可以做，但我找不到合适/最快的解决方案。

1. file_get_contents（）：大约需要6秒
2. 使用cURL：大约需要3秒
3. jquery getJSON：花费不到1秒

这是什么意思？我的服务器有问题吗？或者我需要使用其他功能吗？

- 额外的信息： 我已经创建了一个包含多个域的测试。

<?php
$time_start = microtime(true);
$data = file_get_contents("https://www.linkedin.com");
$time_end = microtime(true);
$time[test1] = $time_end - $time_start;

$time_start = microtime(true);
$data = file_get_contents("https://stackoverflow.com/");
$time_end = microtime(true);
$time[test2] = $time_end - $time_start;

$time_start = microtime(true);
$data = file_get_contents("https://www.google.com");
$time_end = microtime(true);
$time[test3] = $time_end - $time_start;

$time_start = microtime(true);
$data = file_get_contents("https://www.expedia.com");
$time_end = microtime(true);
$time[test4] = $time_end - $time_start;

$time_start = microtime(true);
$data = file_get_contents("https://www.booking.com");
$time_end = microtime(true);
$time[test5] = $time_end - $time_start;

print_r($time);
?>

<?php $time_start = microtime(true); $data = file_get_contents("https://www.linkedin.com"); $time_end = microtime(true); $time[test1] = $time_end - $time_start; $time_start = microtime(true); $data = file_get_contents("https://stackoverflow.com/"); $time_end = microtime(true); $time[test2] = $time_end - $time_start; $time_start = microtime(true); $data = file_get_contents("https://www.google.com"); $time_end = microtime(true); $time[test3] = $time_end - $time_start; $time_start = microtime(true); $data = file_get_contents("https://www.expedia.com"); $time_end = microtime(true); $time[test4] = $time_end - $time_start; $time_start = microtime(true); $data = file_get_contents("https://www.booking.com"); $time_end = microtime(true); $time[test5] = $time_end - $time_start; print_r($time); ?> 输出如下：

    Array
    (
        [test1] => 3.5712170600891
        [test2] => 0.92465400695801
        [test3] => 6.2011067867279
        [test4] => 1.8765568733215
        [test5] => 1.758278131485
    )