diff --git a/mod/admin.php b/mod/admin.php
index e3b537fcf0..c50927e97c 100644
--- a/mod/admin.php
+++ b/mod/admin.php
@@ -181,32 +181,33 @@ function admin_content(App $a)
 	// array(url, name, extra css classes)
 	// not part of $aside to make the template more adjustable
 	$aside_sub = [
-		'information' => [ L10n::t('Information'), [
-			"overview" => ["admin/", L10n::t("Overview"), "overview" ],
-			'federation'   => ["admin/federation/"  , L10n::t('Federation Statistics'), "federation"] ]],
-		'configuration' => [ L10n::t('Configuration'), [
-			'site'         => ["admin/site/"        , L10n::t("Site")                 , "site"],
-			'users'        => ["admin/users/"       , L10n::t("Users")                , "users"],
-			'addons'       => ["admin/addons/"      , L10n::t("Addons")               , "addons"],
-			'themes'       => ["admin/themes/"      , L10n::t("Themes")               , "themes"],
-			'features'     => ["admin/features/"    , L10n::t("Additional features")  , "features"],
-			'tos'          => ["admin/tos/"         , L10n::t("Terms of Service")     , "tos"] ]],
-		'database' => [ L10n::t('Database'), [
-			'dbsync'       => ["admin/dbsync/"      , L10n::t('DB updates')           , "dbsync"],
-			'queue'        => ["admin/queue/"       , L10n::t('Inspect Queue')        , "queue"],
-			'workerqueue'  => ["admin/workerqueue/" , L10n::t('Inspect worker Queue') , "workerqueue"] ]],
-		'tools' => [ L10n::t('Tools'), [
-			'contactblock' => ["admin/contactblock/", L10n::t('Contact Blocklist')    , "contactblock"],
-			'blocklist'    => ["admin/blocklist/"   , L10n::t('Server Blocklist')     , "blocklist"],
-			'deleteitem'   => ["admin/deleteitem/"  , L10n::t('Delete Item')          , 'deleteitem'], ]],
-		"logs" => [ L10n::t("Logs"), [
-			"logsconfig" => ["admin/logs/", L10n::t("Logs"), "logs"],
-			"logsview" => ["admin/viewlogs/", L10n::t("View Logs"), 'viewlogs']
+		'information' => [L10n::t('Information'), [
+			'overview' => ['admin/', L10n::t('Overview'), 'overview'],
+			'federation'   => ['admin/federation/'  , L10n::t('Federation Statistics'), 'federation']]],
+		'configuration' => [L10n::t('Configuration'), [
+			'site'         => ['admin/site/'        , L10n::t('Site')                    , 'site'],
+			'users'        => ['admin/users/'       , L10n::t('Users')                   , 'users'],
+			'addons'       => ['admin/addons/'      , L10n::t('Addons')                  , 'addons'],
+			'themes'       => ['admin/themes/'      , L10n::t('Themes')                  , 'themes'],
+			'features'     => ['admin/features/'    , L10n::t('Additional features')     , 'features'],
+			'tos'          => ['admin/tos/'         , L10n::t('Terms of Service')        , 'tos']]],
+		'database' => [L10n::t('Database'), [
+			'dbsync'       => ['admin/dbsync/'      , L10n::t('DB updates')              , 'dbsync'],
+			'queue'        => ['admin/queue/'       , L10n::t('Inspect Queue')           , 'queue'],
+			'deferred'     => ['admin/deferred/'    , L10n::t('Inspect Deferred Workers'), 'deferred'],
+			'workerqueue'  => ['admin/workerqueue/' , L10n::t('Inspect worker Queue')    , 'workerqueue']]],
+		'tools' => [L10n::t('Tools'), [
+			'contactblock' => ['admin/contactblock/', L10n::t('Contact Blocklist')       , 'contactblock'],
+			'blocklist'    => ['admin/blocklist/'   , L10n::t('Server Blocklist')        , 'blocklist'],
+			'deleteitem'   => ['admin/deleteitem/'  , L10n::t('Delete Item')             , 'deleteitem'],]],
+		'logs' => [L10n::t('Logs'), [
+			'logsconfig' => ['admin/logs/', L10n::t('Logs'), 'logs'],
+			'logsview' => ['admin/viewlogs/', L10n::t('View Logs'), 'viewlogs']
 		]],
-		"diagnostics" => [ L10n::t("Diagnostics"), [
-			"phpinfo" => ['phpinfo/', L10n::t('PHP Info'), 'phpinfo'],
-			"probe" => ['probe/', L10n::t('probe address'), 'probe'],
-			"webfinger" =>['webfinger/', L10n::t('check webfinger'), 'webfinger']
+		'diagnostics' => [L10n::t('Diagnostics'), [
+			'phpinfo' => ['phpinfo/', L10n::t('PHP Info'), 'phpinfo'],
+			'probe' => ['probe/', L10n::t('probe address'), 'probe'],
+			'webfinger' =>['webfinger/', L10n::t('check webfinger'), 'webfinger']
 		]]
 	];
 
@@ -264,8 +265,11 @@ function admin_content(App $a)
 			case 'queue':
 				$o = admin_page_queue($a);
 				break;
+			case 'deferred':
+				$o = admin_page_workerqueue($a, true);
+				break;
 			case 'workerqueue':
-				$o = admin_page_workerqueue($a);
+				$o = admin_page_workerqueue($a, false);
 				break;
 			case 'federation':
 				$o = admin_page_federation($a);
@@ -790,10 +794,20 @@ function admin_page_queue(App $a)
  * @param App $a
  * @return string
  */
-function admin_page_workerqueue(App $a)
+function admin_page_workerqueue(App $a, $deferred)
 {
 	// get jobs from the workerqueue table
-	$entries = DBA::select('workerqueue', ['id', 'parameter', 'created', 'priority'], ['done' => 0], ['order'=> ['priority']]);
+	if ($deferred) {
+		$condition = ["NOT `done` AND `next_try` > ?", DateTimeFormat::utcNow()];
+		$sub_title = L10n::t('Inspect Deferred Worker Queue');
+		$info = L10n::t("This page lists the deferred worker jobs. This are jobs that couldn't be executed at the first time.");
+	} else {
+		$condition = ["NOT `done` AND `next_try` < ?", DateTimeFormat::utcNow()];
+		$sub_title = L10n::t('Inspect Worker Queue');
+		$info = L10n::t('This page lists the currently queued worker jobs. These jobs are handled by the worker cronjob you\'ve set up during install.');
+	}
+
+	$entries = DBA::select('workerqueue', ['id', 'parameter', 'created', 'priority'], $condition, ['order'=> ['priority']]);
 
 	$r = [];
 	while ($entry = DBA::fetch($entries)) {
@@ -807,13 +821,13 @@ function admin_page_workerqueue(App $a)
 	$t = get_markup_template('admin/workerqueue.tpl');
 	return replace_macros($t, [
 		'$title' => L10n::t('Administration'),
-		'$page' => L10n::t('Inspect Worker Queue'),
+		'$page' => $sub_title,
 		'$count' => count($r),
 		'$id_header' => L10n::t('ID'),
 		'$param_header' => L10n::t('Job Parameters'),
 		'$created_header' => L10n::t('Created'),
 		'$prio_header' => L10n::t('Priority'),
-		'$info' => L10n::t('This page lists the currently queued worker jobs. These jobs are handled by the worker cronjob you\'ve set up during install.'),
+		'$info' => $info,
 		'$entries' => $r,
 	]);
 }
@@ -900,15 +914,17 @@ function admin_page_summary(App $a)
 
 	$pending = Register::getPendingCount();
 
-	$r = q("SELECT COUNT(*) AS `total` FROM `queue` WHERE 1");
-	$queue = (($r) ? $r[0]['total'] : 0);
+	$queue = DBA::count('queue', []);
 
-	$r = q("SELECT COUNT(*) AS `total` FROM `workerqueue` WHERE NOT `done`");
-	$workerqueue = (($r) ? $r[0]['total'] : 0);
+	$deferred = DBA::count('workerqueue', ["`executed` <= ? AND NOT `done` AND `next_try` > ?",
+		DBA::NULL_DATETIME, DateTimeFormat::utcNow()]);
+
+	$workerqueue = DBA::count('workerqueue', ["`executed` <= ? AND NOT `done` AND `next_try` < ?",
+		DBA::NULL_DATETIME, DateTimeFormat::utcNow()]);
 
 	// We can do better, but this is a quick queue status
 
-	$queues = ['label' => L10n::t('Message queues'), 'queue' => $queue, 'workerq' => $workerqueue];
+	$queues = ['label' => L10n::t('Message queues'), 'queue' => $queue, 'deferred' => $deferred, 'workerq' => $workerqueue];
 
 
 	$r = q("SHOW variables LIKE 'max_allowed_packet'");
diff --git a/src/Core/Worker.php b/src/Core/Worker.php
index 76400d4698..a3c5884604 100644
--- a/src/Core/Worker.php
+++ b/src/Core/Worker.php
@@ -146,6 +146,17 @@ class Worker
 		logger("Couldn't select a workerqueue entry, quitting process " . getmypid() . ".", LOGGER_DEBUG);
 	}
 
+	/**
+	 * @brief Returns the number of deferred entries in the worker queue
+	 *
+	 * @return integer Number of deferred entries in the worker queue
+	 */
+	private static function deferredEntries()
+	{
+		return DBA::count('workerqueue', ["`executed` <= ? AND NOT `done` AND `next_try` > ?",
+			DBA::NULL_DATETIME, DateTimeFormat::utcNow()]);
+	}
+
 	/**
 	 * @brief Returns the number of non executed entries in the worker queue
 	 *
@@ -679,6 +690,7 @@ class Worker
 			}
 
 			$entries = self::totalEntries();
+			$deferred = self::deferredEntries();
 
 			if (Config::get("system", "worker_fastlane", false) && ($queues > 0) && ($entries > 0) && ($active >= $queues)) {
 				$top_priority = self::highestPriority();
@@ -690,7 +702,7 @@ class Worker
 				}
 			}
 
-			logger("Load: ".$load."/".$maxsysload." - processes: ".$active."/".$entries.$processlist." - maximum: ".$queues."/".$maxqueues, LOGGER_DEBUG);
+			logger("Load: " . $load ."/" . $maxsysload . " - processes: " . $deferred . "/" . $active . "/" . $entries . $processlist . " - maximum: " . $queues . "/" . $maxqueues, LOGGER_DEBUG);
 
 			// Are there fewer workers running as possible? Then fork a new one.
 			if (!Config::get("system", "worker_dont_fork", false) && ($queues > ($active + 1)) && ($entries > 1)) {
@@ -797,13 +809,14 @@ class Worker
 		$queue_length = Config::get('system', 'worker_fetch_limit', 1);
 		$lower_job_limit = $worker_queues * $queue_length * 2;
 		$jobs = self::totalEntries();
+		$deferred = self::deferredEntries();
 
 		// Now do some magic
 		$exponent = 2;
 		$slope = $queue_length / pow($lower_job_limit, $exponent);
 		$limit = min($queue_length, ceil($slope * pow($jobs, $exponent)));
 
-		logger('Total: '.$jobs.' - Maximum: '.$queue_length.' - jobs per queue: '.$limit, LOGGER_DEBUG);
+		logger('Deferred: ' . $deferred . ' - Total: ' . $jobs . ' - Maximum: ' . $queue_length . ' - jobs per queue: ' . $limit, LOGGER_DEBUG);
 		$ids = [];
 		if (self::passingSlow($highest_priority)) {
 			// Are there waiting processes with a higher priority than the currently highest?
diff --git a/src/Protocol/ActivityPub/Processor.php b/src/Protocol/ActivityPub/Processor.php
index 9bafb5e175..8a80bd2bea 100644
--- a/src/Protocol/ActivityPub/Processor.php
+++ b/src/Protocol/ActivityPub/Processor.php
@@ -17,10 +17,7 @@ use Friendica\Core\Config;
 use Friendica\Protocol\ActivityPub;
 
 /**
- * ActivityPub Protocol class
- *
- * To-Do:
- * - Store Diaspora signature
+ * ActivityPub Processor Protocol class
  */
 class Processor
 {
diff --git a/src/Protocol/ActivityPub/Transmitter.php b/src/Protocol/ActivityPub/Transmitter.php
index a37d035377..b0e6cd3629 100644
--- a/src/Protocol/ActivityPub/Transmitter.php
+++ b/src/Protocol/ActivityPub/Transmitter.php
@@ -39,9 +39,6 @@ require_once 'include/api.php';
  *
  * Complicated object types:
  * - Undo Announce
- *
- * General:
- * - Queueing unsucessful deliveries
  */
 class Transmitter
 {
diff --git a/src/Worker/RemoveContact.php b/src/Worker/RemoveContact.php
index 8f986eab11..2e3f16db3e 100644
--- a/src/Worker/RemoveContact.php
+++ b/src/Worker/RemoveContact.php
@@ -7,6 +7,7 @@ namespace Friendica\Worker;
 
 use Friendica\Database\DBA;
 use Friendica\Core\Protocol;
+use Friendica\Model\Item;
 
 require_once 'include/dba.php';
 
@@ -15,12 +16,21 @@ class RemoveContact {
 
 		// Only delete if the contact is to be deleted
 		$condition = ['network' => Protocol::PHANTOM, 'id' => $id];
-		$r = DBA::exists('contact', $condition);
-		if (!DBA::isResult($r)) {
+		$contact = DBA::selectFirst('contact', ['uid'], $condition);
+		if (!DBA::isResult($contact)) {
 			return;
 		}
 
 		// Now we delete the contact and all depending tables
+		$condition = ['uid' => $contact['uid'], 'contact-id' => $id];
+		do {
+			$items = Item::select(['id'], $condition, ['limit' => 100]);
+			while ($item = Item::fetch($items)) {
+				DBA::delete('item', ['id' => $item['id']]);
+			}
+			DBA::close($items);
+		} while (Item::exists($condition));
+
 		DBA::delete('contact', ['id' => $id]);
 	}
 }
diff --git a/src/Worker/RemoveUser.php b/src/Worker/RemoveUser.php
index dfa5ccc097..d8966e5a49 100644
--- a/src/Worker/RemoveUser.php
+++ b/src/Worker/RemoveUser.php
@@ -20,6 +20,13 @@ class RemoveUser {
 		}
 
 		// Now we delete all user items
-		Item::delete(['uid' => $uid], PRIORITY_LOW);
+		$condition = ['uid' => $uid, 'deleted' => false];
+		do {
+			$items = Item::select(['id'], $condition, ['limit' => 100]);
+			while ($item = Item::fetch($items)) {
+				Item::deleteById($item['id'], PRIORITY_LOW);
+			}
+			DBA::close($items);
+		} while (Item::exists($condition));
 	}
 }
diff --git a/view/templates/admin/summary.tpl b/view/templates/admin/summary.tpl
index 202fd43b3e..298097f792 100644
--- a/view/templates/admin/summary.tpl
+++ b/view/templates/admin/summary.tpl
@@ -11,7 +11,7 @@
 
 	<dl>
 		<dt>{{$queues.label}}</dt>
-		<dd><a href="{{$baseurl}}/admin/queue">{{$queues.queue}}</a> - <a href="{{$baseurl}}/admin/workerqueue">{{$queues.workerq}}</a></dd>
+		<dd><a href="{{$baseurl}}/admin/queue">{{$queues.queue}}</a> - <a href="{{$baseurl}}/admin/deferred">{{$queues.deferred}} - <a href="{{$baseurl}}/admin/workerqueue">{{$queues.workerq}}</a></dd>
 	</dl>
 	<dl>
 		<dt>{{$pending.0}}</dt>
diff --git a/view/theme/frio/templates/admin/summary.tpl b/view/theme/frio/templates/admin/summary.tpl
index 3c33f92fdb..66afda721b 100644
--- a/view/theme/frio/templates/admin/summary.tpl
+++ b/view/theme/frio/templates/admin/summary.tpl
@@ -14,7 +14,7 @@
 		{{* The work queues short statistic. *}}
 		<div id="admin-summary-queues" class="col-lg-12 col-md-12 col-sm-12 col-xs-12 admin-summary">
 			<div class="col-lg-4 col-md-4 col-sm-4 col-xs-12 admin-summary-label-name text-muted">{{$queues.label}}</div>
-			<div class="col-lg-8 col-md-8 col-sm-8 col-xs-12 admin-summary-entry"><a href="{{$baseurl}}/admin/queue">{{$queues.queue}}</a> - <a href="{{$baseurl}}/admin/workerqueue">{{$queues.workerq}}</a></div>
+			<div class="col-lg-8 col-md-8 col-sm-8 col-xs-12 admin-summary-entry"><a href="{{$baseurl}}/admin/queue">{{$queues.queue}}</a> - <a href="{{$baseurl}}/admin/deferred">{{$queues.deferred}} - <a href="{{$baseurl}}/admin/workerqueue">{{$queues.workerq}}</a></div>
 		</div>
 
 		{{* Number of pending registrations. *}}