Database traag

<? if(empty($_GET['pagina']))
	header("location: ../../content.php?pagina=forum/forum");

$select = "SELECT * FROM forum_categorieen ORDER BY naam";
$query = mysql_query($select)or die(mysql_error());

if(mysql_num_rows($query) == 0)
{
	echo "<div class=\"titel\">Fout</div>";
	echo "<div class=\"bericht\">Er zijn nog geen forumcategorieen aangemaakt...</div>";
}
else
{
	while($list = mysql_fetch_object($query)) 
	{
		echo "<div class=\"titel\">";
		echo "<table cellpadding=\"0\" cellspacing=\"0\" border=\"0\" width=\"98%\">";				
		echo "<tr>";
		echo "<td width=\"5%\"></td>";
		echo "<td width=\"45%\"><b>".htmlspecialchars($list->naam)."</b></td>";
		echo "<td width=\"10%\"><b>Topics</b></td>";
		echo "<td width=\"10%\"><b>Reacties</b></td>";
		echo "<td width=\"30%\"><b>Laatste post</b></td>";
		echo "</tr>";	
		echo "</table>";
		echo "</div>";
		echo "<div class=\"bericht\">";
		echo "<table cellpadding=\"2\" cellspacing=\"0\" border=\"0\" width=\"98%\">";				
	
		$select2 = "SELECT * FROM forum_subcategorieen WHERE categorieid = '".$list->id."' ORDER BY naam";
		$query2 = mysql_query($select2)or die(mysql_error());

		if(mysql_num_rows($query2) == 0)
		{	
			echo "<tr>";
			echo "<td colspan=\"5\">Geen subcategorieën aanwezig...</td>";
			echo "</tr>";
		}
		else
		{
			while($list2 = mysql_fetch_object($query2))			
			{
				$select3 = "SELECT * FROM forum_onderwerpen WHERE forum = '".$list2->id."'";
				$query3 = mysql_query($select3)or die(mysql_error());

				$select4 = "SELECT * FROM forum_onderwerpen WHERE forum = '".$list2->id."' ORDER BY id DESC LIMIT 0,1";
				$query4 = mysql_query($select4)or die(mysql_error());
				$list4 = mysql_fetch_object($query4);

				$select5 = "SELECT forum_reacties.datum AS datum, forum_reacties.auteur AS auteur, forum_reacties.naam_anoniem AS naam_anoniem 
								FROM forum_reacties JOIN forum_onderwerpen ON forum_reacties.topicid = forum_onderwerpen.id 
								WHERE forum_onderwerpen.forum = '".$list2->id."' ORDER BY forum_reacties.id DESC LIMIT 0,1";
				$query5 = mysql_query($select5)or die(mysql_error());
				$list5 = mysql_fetch_object($query5);

				if(mysql_num_rows($query4) == 0 && mysql_num_rows($query5) == 0)
					$laatste = "Geen";
				elseif($list4->datum > $list5->datum)
				{
					$select6 = "SELECT * FROM leden_gegevens WHERE id = '".$list4->auteur."'";
					$query6 = mysql_query($select6)or die(mysql_error());
					$list6 = mysql_fetch_object($query6);
					
					$door = $list6->gebruikersnaam;	
					$door = strip_tags($door);
					$door = strtolower($door);
					$door = ucwords($door);

					if ($list6->status == "Beheerder") 
						$gebruikersnaam = "$door";
					elseif ($list6->status == "SuperModerator") 
						$gebruikersnaam = "$door";
					elseif ($list6->status == "Moderator") 
						$gebruikersnaam = "$door";
					elseif ($list6->status == "Verbannen") 
						$gebruikersnaam = "$door";
					else
						$gebruikersnaam = $door;

					$laatste = "Door <a href=\"content.php?pagina=leden/profiel&amp;id=".$list6->id."\">".$gebruikersnaam."</a><br />@ ".date("d-m-Y H:i:s", strtotime($list4->datum))."";
				}
				else
				{
					if($list5->auteur != 99999999){
						$select7 = "SELECT * FROM leden_gegevens WHERE id = '".$list5->auteur."'";
						$query7 = mysql_query($select7)or die(mysql_error());
						$list7 = mysql_fetch_object($query7);
							
						$door = $list7->gebruikersnaam;	
						$door = strip_tags($door);
						$door = strtolower($door);
						$door = ucwords($door);
						
						if ($list7->status == "Beheerder") 
						$gebruikersnaam = "$door";
						elseif ($list7->status == "SuperModerator") 
							$gebruikersnaam = "$door";
						elseif ($list7->status == "Moderator") 
							$gebruikersnaam = "$door";
						elseif ($list7->status == "Verbannen") 
							$gebruikersnaam = "$door";
						else
							$gebruikersnaam = $door;
					} else {
						$gebruikersnaam = $list5->naam_anoniem;
					}

					$laatste = "Door <a href=\"content.php?pagina=leden/profiel&amp;id=".$list7->id."\">".$gebruikersnaam."</a><br />@ ".date("d-m-Y H:i:s", strtotime($list5->datum))."";
				}

				$select8 = mysql_query("SELECT COUNT(*) FROM forum_reacties,forum_onderwerpen WHERE forum_onderwerpen.forum = '".$list2->id."' AND forum_reacties.topicid = forum_onderwerpen.id")or die(mysql_error()); 
				$reacties = mysql_result($select8, 0); 

				echo "<tr onclick=\"window.location.href='content.php?pagina=forum/bekijk&amp;id=".$list2->id."'\">";
				echo "<td width=\"5%\"><img src=\"afbeeldingen/forum.gif\" alt=\"Forum\"/></td>";
				echo "<td width=\"45%\"><a href=\"content.php?pagina=forum/bekijk&amp;id=".$list2->id."\"><b>".htmlspecialchars($list2->naam)."</b></a><br />".htmlspecialchars($list2->omschrijving)."</td>";
				echo "<td width=\"10%\">".mysql_num_rows($query3)."</td>";
				echo "<td width=\"10%\">".$reacties."</td>";
				echo "<td width=\"30%\">".$laatste."</td>";
				echo "</tr>";
			}
		}
		
		echo "</table></div>";
	}
}
?>