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POWhy is this WebRequest code slow?
 

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    <p>I requested 100 pages that all 404. I wrote</p> <pre><code> { var s = DateTime.Now; for(int i=0; i &lt; 100;i++) DL.CheckExist("http://google.com/lol" + i.ToString() + ".jpg"); var e = DateTime.Now; var d = e-s; d=d; Console.WriteLine(d); } static public bool CheckExist(string url) { HttpWebRequest wreq = null; HttpWebResponse wresp = null; bool ret = false; try { wreq = (HttpWebRequest)WebRequest.Create(url); wreq.KeepAlive = true; wreq.Method = "HEAD"; wresp = (HttpWebResponse)wreq.GetResponse(); ret = true; } catch (System.Net.WebException) { } finally { if (wresp != null) wresp.Close(); } return ret; } </code></pre> <p>Two runs show it takes 00:00:30.7968750 and 00:00:26.8750000. Then i tried firefox and use the following code</p> <pre><code>&lt;html&gt; &lt;body&gt; &lt;script type="text/javascript"&gt; for(var i=0; i&lt;100; i++) document.write("&lt;img src=http://google.com/lol" + i + ".jpg&gt;&lt;br&gt;"); &lt;/script&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <p>Using my comp time and counting it was roughly 4 seconds. 4 seconds is 6.5-7.5faster then my app. I plan to scan through a thousands of files so taking 3.75hours instead of 30mins would be a big problem. How can i make this code faster? I know someone will say firefox caches the images but i want to say 1) it still needs to check the headers from the remote server to see if it has been updated (which is what i want my app to do) 2) I am not receiving the body, my code should only be requesting the header. So, how do i solve this?</p>
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