how to speed this up?

[tanfwc]

it seem to be slowing my board down. The SQL backend is quite fast.

mysql_connect('','',''); 
mysql_select_db(''); 

$mins = 60; 

$time = time(); 
$ip = $_SERVER['REMOTE_ADDR']; 
$user_agent = $_SERVER["HTTP_USER_AGENT"]; 
$referrer = @$_SERVER['HTTP_REFERER']; 

$sql = "SELECT `time` FROM `log` WHERE `ip` = '$ip' ORDER BY `time` DESC LIMIT 1"; #check if the users IP is in the DB (and if so, grap that latest timestamp) 
$results = mysql_query($sql); 
if (mysql_num_rows($results) != 0) { #if a row was returned 
    $loggedtime = mysql_fetch_array($results);  
    $loggedtime = $loggedtime[0]; #set to the latest time the user was on the page 
} 

if ($loggedtime+$mins*60 < time()) { #in english: if (the last timestamp we have for this use + the desired number of minutes * 60 is less than the current time) 
    $sql = "INSERT INTO `log` (`id`, `time`, `ip`, `user_agent`, `referrer`) 
    VALUES ('', '$time', '$ip', '$user_agent', '$referrer')"; 
    mysql_query($sql); 
} 

thx