diff --git a/sections/ajax/top10/torrents.php b/sections/ajax/top10/torrents.php
index ce63d336..ec5b7933 100644
--- a/sections/ajax/top10/torrents.php
+++ b/sections/ajax/top10/torrents.php
@@ -22,6 +22,7 @@
 	g.ID,
 	g.Name,
 	g.CategoryID,
+	g.wikiImage,
 	g.TagList,
 	t.Format,
 	t.Encoding,
@@ -36,7 +37,8 @@
 	t.Snatched,
 	t.Seeders,
 	t.Leechers,
-	((t.Size * t.Snatched) + (t.Size * 0.5 * t.Leechers)) AS Data
+	((t.Size * t.Snatched) + (t.Size * 0.5 * t.Leechers)) AS Data,
+	g.ReleaseType
 	FROM torrents AS t
 	LEFT JOIN torrents_group AS g ON g.ID = t.GroupID ";
 
@@ -44,87 +46,117 @@
 
 if($Details == 'all' || $Details == 'day') {
 	if (!$TopTorrentsActiveLastDay = $Cache->get_value('top10tor_day_'.$Limit.$WhereSum)) {
-		$DayAgo = time_minus(86400);
-		$Query = $BaseQuery.' WHERE t.Seeders>0 AND ';
-		if (!empty($Where)) { $Query .= $Where.' AND '; }
-		$Query .= "
-			t.Time>'$DayAgo'
-			ORDER BY (t.Seeders + t.Leechers) DESC
-			LIMIT $Limit;";
-		$DB->query($Query);
-		$TopTorrentsActiveLastDay = $DB->to_array();
-		$Cache->cache_value('top10tor_day_'.$Limit.$WhereSum,$TopTorrentsActiveLastDay,3600*2);
+		if ($Cache->get_query_lock('top10')) {
+			$DayAgo = time_minus(86400);
+			$Query = $BaseQuery.' WHERE t.Seeders>0 AND ';
+			if (!empty($Where)) { $Query .= $Where.' AND '; }
+			$Query .= "
+				t.Time>'$DayAgo'
+				ORDER BY (t.Seeders + t.Leechers) DESC
+				LIMIT $Limit;";
+			$DB->query($Query);
+			$TopTorrentsActiveLastDay = $DB->to_array(false, MYSQLI_NUM);
+			$Cache->cache_value('top10tor_day_'.$Limit.$WhereSum,$TopTorrentsActiveLastDay,3600*2);
+			$Cache->clear_query_lock('top10');
+		} else {
+			$TopTorrentsActiveLastDay = false;
+		}
 	}
 	$OuterResults[] = generate_torrent_json('Most Active Torrents Uploaded in the Past Day', 'day', $TopTorrentsActiveLastDay, $Limit);
 }
 if($Details == 'all' || $Details == 'week') {
 	if (!$TopTorrentsActiveLastWeek = $Cache->get_value('top10tor_week_'.$Limit.$WhereSum)) {
-		$WeekAgo = time_minus(604800);
-		$Query = $BaseQuery.' WHERE ';
-		if (!empty($Where)) { $Query .= $Where.' AND '; }
-		$Query .= "
-			t.Time>'$WeekAgo'
-			ORDER BY (t.Seeders + t.Leechers) DESC
-			LIMIT $Limit;";
-		$DB->query($Query);
-		$TopTorrentsActiveLastWeek = $DB->to_array();
-		$Cache->cache_value('top10tor_week_'.$Limit.$WhereSum,$TopTorrentsActiveLastWeek,3600*6);
+		if ($Cache->get_query_lock('top10')) {
+			$WeekAgo = time_minus(604800);
+			$Query = $BaseQuery.' WHERE ';
+			if (!empty($Where)) { $Query .= $Where.' AND '; }
+			$Query .= "
+				t.Time>'$WeekAgo'
+				ORDER BY (t.Seeders + t.Leechers) DESC
+				LIMIT $Limit;";
+			$DB->query($Query);
+			$TopTorrentsActiveLastWeek = $DB->to_array(false, MYSQLI_NUM);
+			$Cache->cache_value('top10tor_week_'.$Limit.$WhereSum,$TopTorrentsActiveLastWeek,3600*6);
+			$Cache->clear_query_lock('top10');
+		} else {
+			$TopTorrentsActiveLastWeek = false;
+		}
 	}
 	$OuterResults[] = generate_torrent_json('Most Active Torrents Uploaded in the Past Week', 'week', $TopTorrentsActiveLastWeek, $Limit);
 }
 
 if($Details == 'all' || $Details == 'overall') {
 	if (!$TopTorrentsActiveAllTime = $Cache->get_value('top10tor_overall_'.$Limit.$WhereSum)) {
-		// IMPORTANT NOTE - we use WHERE t.Seeders>500 in order to speed up this query. You should remove it!
-		$Query = $BaseQuery;
-		if (!empty($Where)) { $Query .= ' WHERE '.$Where; }
-		elseif ($Details=='all') { $Query .= " WHERE t.Seeders>500 "; }
-		$Query .= "
-			ORDER BY (t.Seeders + t.Leechers) DESC
-			LIMIT $Limit;";
-		$DB->query($Query);
-		$TopTorrentsActiveAllTime = $DB->to_array();
-		$Cache->cache_value('top10tor_overall_'.$Limit.$WhereSum,$TopTorrentsActiveAllTime,3600*6);
+		if ($Cache->get_query_lock('top10')) {
+			// IMPORTANT NOTE - we use WHERE t.Seeders>500 in order to speed up this query. You should remove it!
+			$Query = $BaseQuery;
+			if (!empty($Where)) { $Query .= ' WHERE '.$Where; }
+			elseif ($Details=='all') { $Query .= " WHERE t.Seeders>500 "; }
+			$Query .= "
+				ORDER BY (t.Seeders + t.Leechers) DESC
+				LIMIT $Limit;";
+			$DB->query($Query);
+			$TopTorrentsActiveAllTime = $DB->to_array(false, MYSQLI_NUM);
+			$Cache->cache_value('top10tor_overall_'.$Limit.$WhereSum,$TopTorrentsActiveAllTime,3600*6);
+			$Cache->clear_query_lock('top10');
+		} else {
+			$TopTorrentsActiveAllTime = false;
+		}
 	}
 	$OuterResults[] = generate_torrent_json('Most Active Torrents of All Time', 'overall', $TopTorrentsActiveAllTime, $Limit);
 }
 
 if(($Details == 'all' || $Details == 'snatched') && empty($Where)) {
 	if (!$TopTorrentsSnatched = $Cache->get_value('top10tor_snatched_'.$Limit.$WhereSum)) {
-		$Query = $BaseQuery;
-		$Query .= "
-			ORDER BY t.Snatched DESC
-			LIMIT $Limit;";
-		$DB->query($Query);
-		$TopTorrentsSnatched = $DB->to_array();
-		$Cache->cache_value('top10tor_snatched_'.$Limit.$WhereSum,$TopTorrentsSnatched,3600*6);
+		if ($Cache->get_query_lock('top10')) {
+			$Query = $BaseQuery;
+			$Query .= "
+				ORDER BY t.Snatched DESC
+				LIMIT $Limit;";
+			$DB->query($Query);
+			$TopTorrentsSnatched = $DB->to_array(false, MYSQLI_NUM);
+			$Cache->cache_value('top10tor_snatched_'.$Limit.$WhereSum,$TopTorrentsSnatched,3600*6);
+			$Cache->clear_query_lock('top10');
+		} else {
+			$TopTorrentsSnatched = false;
+		}
 	}
 	$OuterResults[] = generate_torrent_json('Most Snatched Torrents', 'snatched', $TopTorrentsSnatched, $Limit);
 }
 
 if(($Details == 'all' || $Details == 'data') && empty($Where)) {
 	if (!$TopTorrentsTransferred = $Cache->get_value('top10tor_data_'.$Limit.$WhereSum)) {
-		// IMPORTANT NOTE - we use WHERE t.Snatched>100 in order to speed up this query. You should remove it!
-		$Query = $BaseQuery;
-		if ($Details=='all') { $Query .= " WHERE t.Snatched>100 "; }
-		$Query .= "
-			ORDER BY Data DESC
-			LIMIT $Limit;";
-		$DB->query($Query);
-		$TopTorrentsTransferred = $DB->to_array();
-		$Cache->cache_value('top10tor_data_'.$Limit.$WhereSum,$TopTorrentsTransferred,3600*6);
+		if ($Cache->get_query_lock('top10')) {
+			// IMPORTANT NOTE - we use WHERE t.Snatched>100 in order to speed up this query. You should remove it!
+			$Query = $BaseQuery;
+			if ($Details=='all') { $Query .= " WHERE t.Snatched>100 "; }
+			$Query .= "
+				ORDER BY Data DESC
+				LIMIT $Limit;";
+			$DB->query($Query);
+			$TopTorrentsTransferred = $DB->to_array(false, MYSQLI_NUM);
+			$Cache->cache_value('top10tor_data_'.$Limit.$WhereSum,$TopTorrentsTransferred,3600*6);
+			$Cache->clear_query_lock('top10');
+		} else {
+			$TopTorrentsTransferred = false;
+		}
 	}
 	$OuterResults[] = generate_torrent_json('Most Data Transferred Torrents', 'data', $TopTorrentsTransferred, $Limit);
 }
 
 if(($Details == 'all' || $Details == 'seeded') && empty($Where)) {
 	if (!$TopTorrentsSeeded = $Cache->get_value('top10tor_seeded_'.$Limit.$WhereSum)) {
-		$Query = $BaseQuery."
-			ORDER BY t.Seeders DESC
-			LIMIT $Limit;";
-		$DB->query($Query);
-		$TopTorrentsSeeded = $DB->to_array();
-		$Cache->cache_value('top10tor_seeded_'.$Limit.$WhereSum,$TopTorrentsSeeded,3600*6);
+		if ($Cache->get_query_lock('top10')) {
+			$Query = $BaseQuery."
+				ORDER BY t.Seeders DESC
+				LIMIT $Limit;";
+			$DB->query($Query);
+			$TopTorrentsSeeded = $DB->to_array(false, MYSQLI_NUM);
+			$Cache->cache_value('top10tor_seeded_'.$Limit.$WhereSum,$TopTorrentsSeeded,3600*6);
+			$Cache->clear_query_lock('top10');
+		} else {
+			$TopTorrentsSeeded = false;
+		}
 	}
 	$OuterResults[] = generate_torrent_json('Best Seeded Torrents', 'seeded', $TopTorrentsSeeded, $Limit);
 }
@@ -141,10 +173,19 @@
 function generate_torrent_json($Caption, $Tag, $Details, $Limit) {
 	global $LoggedUser,$Categories;
 	$results = array();
+	if ($Details === false) {
+		// Failed to get cache lock; server is (hopefully) already processing a top10 request
+		return array(
+			'caption' => $Caption,
+			'tag' => $Tag,
+			'limit' => (int) $Limit,
+			'results' => array()
+		);
+	}
 	foreach ($Details as $Detail) {
-		list($TorrentID,$GroupID,$GroupName,$GroupCategoryID,$TorrentTags,
+		list($TorrentID,$GroupID,$GroupName,$GroupCategoryID,$WikiImage,$TorrentTags,
 			$Format,$Encoding,$Media,$Scene,$HasLog,$HasCue,$LogScore,$Year,$GroupYear,
-			$RemasterTitle,$Snatched,$Seeders,$Leechers,$Data) = $Detail;
+			$RemasterTitle,$Snatched,$Seeders,$Leechers,$Data,$ReleaseType) = $Detail;
 
 		$Artist = Artists::display_artists(Artists::get_artist($GroupID), false, true);
 		$TruncArtist = substr($Artist, 0, strlen($Artist)-3);
diff --git a/sections/tools/data/registration_log.php b/sections/tools/data/registration_log.php
index b7439903..7f0432b9 100644
--- a/sections/tools/data/registration_log.php
+++ b/sections/tools/data/registration_log.php
@@ -59,7 +59,7 @@
 } else {
 	$RS .= " i.JoinDate > '".time_minus(3600*24*3)."'";
 }
-$RS .= " ORDER BY i.Joindate DESC";
+$RS .= " ORDER BY i.Joindate DESC LIMIT $Limit";
 $QueryID = $DB->query($RS);
 $DB->query("SELECT FOUND_ROWS()");
 list($Results) = $DB->next_record();