减少网站的等待时间(Decrease waiting time for a website)

 我们正在尝试创建一个新网站，当我在浏览器ex：www.mywebsite.com上写下我的网站链接时，等待时间有点高。 
 
 我看到一些网站的等待时间比我的要低，是否可以减少等待时间，我们也在网站上使用memcached？ 
 
 PS：idk究竟是怎样调用的，但我用firebug看到它，它说等待时间。 
 
 谢谢。 
 
 EDITED 
 
 这是我用来从数据库中获取数据的代码： 
 
function f3($id = '') {
    $id = mysql_real_escape_string ($id);
    $sql = 'SELECT id,post_title,post_content,post_date,post_status,term_taxonomy_id,object_id FROM wp_posts, wp_term_relationships WHERE term_taxonomy_id = 60 AND post_status = "publish" AND wp_term_relationships.object_id = id ORDER BY post_date DESC LIMIT 1 OFFSET 2';
    $res = mysql_query($sql) or die (mysql_error());    

if (mysql_num_rows($res) !=0):
    $row = mysql_fetch_assoc($res); 


    $mycontent = $row['post_content'];
    $mycontent = strip_tags($mycontent);
    $mycontent = substr($mycontent,0,150);
    $mycontent = preg_replace("/\[caption.*\[\/caption\]/", '', $mycontent); 


    $title = AvinD($row['post_title']);

    $old_date = $row['post_date'];              // returns Saturday, January 30 10 02:06:34
    $old_date_timestamp = strtotime($old_date);
    $new_date = date('d.m.Y   H:i', $old_date_timestamp); 


    $first_img = '';
    $my1content = AvinD($row['post_content']);
    $output = preg_match_all('/<img.+src=[\'"]([^\'"]+)[\'"].*>/i', $my1content, $matches); 
    $first_img = $matches [1] [0];
    if(empty($first_img)){ //Defines a default image
    $first_img = "/img/default.png";
    }

    echo '
        '.$new_date.'

        <a href="single.php?id='.$row['id'].'"> '.$title.' </a> </div>
         <a href="single.php?id='.$row['id'].'"> <img src="timthumb.php?src='.$first_img.'&amp;h=107&amp;w=190amp;zc=1" alt="" />  </a> </div>
        '.$mycontent.'
    '; //echo

    else:
        echo 'Page dont exist';
    endif;
} // end 

We are trying to create a new website, and when i write the link of my website on the browser ex: www.mywebsite.com, the waiting time is a bit high.
 
I have seen some website that has a lower waiting time then mine, is any way to decrease the waiting time , also we are using memcached for the website?
 
PS: idk exactly how is called, but i see it with firebug, and it says waiting time.
 
Thank you.
 
EDITED
 
This is the codes i have used to get data from database:
 
function f3($id = '') {
    $id = mysql_real_escape_string ($id);
    $sql = 'SELECT id,post_title,post_content,post_date,post_status,term_taxonomy_id,object_id FROM wp_posts, wp_term_relationships WHERE term_taxonomy_id = 60 AND post_status = "publish" AND wp_term_relationships.object_id = id ORDER BY post_date DESC LIMIT 1 OFFSET 2';
    $res = mysql_query($sql) or die (mysql_error());    

if (mysql_num_rows($res) !=0):
    $row = mysql_fetch_assoc($res); 


    $mycontent = $row['post_content'];
    $mycontent = strip_tags($mycontent);
    $mycontent = substr($mycontent,0,150);
    $mycontent = preg_replace("/\[caption.*\[\/caption\]/", '', $mycontent); 


    $title = AvinD($row['post_title']);

    $old_date = $row['post_date'];              // returns Saturday, January 30 10 02:06:34
    $old_date_timestamp = strtotime($old_date);
    $new_date = date('d.m.Y   H:i', $old_date_timestamp); 


    $first_img = '';
    $my1content = AvinD($row['post_content']);
    $output = preg_match_all('/<img.+src=[\'"]([^\'"]+)[\'"].*>/i', $my1content, $matches); 
    $first_img = $matches [1] [0];
    if(empty($first_img)){ //Defines a default image
    $first_img = "/img/default.png";
    }

    echo '
        '.$new_date.'

        <a href="single.php?id='.$row['id'].'"> '.$title.' </a> </div>
         <a href="single.php?id='.$row['id'].'"> <img src="timthumb.php?src='.$first_img.'&amp;h=107&amp;w=190amp;zc=1" alt="" />  </a> </div>
        '.$mycontent.'
    '; //echo

    else:
        echo 'Page dont exist';
    endif;
} // end 

原文：https://stackoverflow.com/questions/7265821