diff --git a/CHANGELOG-2.0.0.md b/CHANGELOG-2.0.0.md
index c11ba2ef..187480ba 100644
--- a/CHANGELOG-2.0.0.md
+++ b/CHANGELOG-2.0.0.md
@@ -8,6 +8,7 @@
 ## Features 
 
 * Feature #262 : Added support to ping eXpansion Analytics.
+* Feature #266 : Add warning that displayes every 5 minutes about dev mode.
 
 # 2.0.0.0-alpha2 (2018-02-03)
 
diff --git a/src/eXpansion/Framework/Core/DependencyInjection/eXpansionCoreExtension.php b/src/eXpansion/Framework/Core/DependencyInjection/eXpansionCoreExtension.php
index 15fb5590..e18808a9 100644
--- a/src/eXpansion/Framework/Core/DependencyInjection/eXpansionCoreExtension.php
+++ b/src/eXpansion/Framework/Core/DependencyInjection/eXpansionCoreExtension.php
@@ -48,5 +48,9 @@ public function load(array $configs, ContainerBuilder $container)
 
         // Temporary for the prototype.
         $loader->load('plugins.yml');
+
+        if ($container->getParameter('kernel.environment') == 'dev') {
+            $loader->load('plugins_dev.yml');
+        }
     }
 }
\ No newline at end of file
diff --git a/src/eXpansion/Framework/Core/Plugins/DevModeNotifier.php b/src/eXpansion/Framework/Core/Plugins/DevModeNotifier.php
new file mode 100644
index 00000000..55b7e916
--- /dev/null
+++ b/src/eXpansion/Framework/Core/Plugins/DevModeNotifier.php
@@ -0,0 +1,81 @@
+<?php
+
+
+namespace eXpansion\Framework\Core\Plugins;
+use eXpansion\Framework\Core\DataProviders\Listener\ListenerInterfaceExpTimer;
+use eXpansion\Framework\Core\Helpers\ChatNotification;
+use eXpansion\Framework\Core\Services\Console;
+
+
+/**
+ * Class DevModeNotifier
+ *
+ * @package eXpansion\Framework\Core\Plugins;
+ * @author  oliver de Cramer <oliverde8@gmail.com>
+ */
+class DevModeNotifier implements ListenerInterfaceExpTimer
+{
+    /** @var ChatNotification */
+    protected $chatNotification;
+
+    /** @var Console */
+    protected $console;
+
+    /** @var int How often notificaiton needs to be displayed */
+    protected $interval = 300;
+
+    /** @var int last time it was displayed. */
+    protected $lastDisplayTime;
+
+    /**
+     * DevModeNotifier constructor.
+     *
+     * @param ChatNotification $chatNotification
+     * @param Console         $console
+     */
+    public function __construct(ChatNotification $chatNotification, Console $console)
+    {
+        $this->chatNotification = $chatNotification;
+        $this->console = $console;
+
+        // Display once 30 seconds after start.
+        $this->lastDisplayTime = time() - $this->interval + 10;
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function onPreLoop()
+    {
+        // nothing
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function onPostLoop()
+    {
+        // nothing
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function onEverySecond()
+    {
+        if (time() > $this->lastDisplayTime + $this->interval) {
+            $this->lastDisplayTime = time();
+
+            $this->console->getSfStyleOutput()->warning(
+                [
+                    "!! eXpansion is running in dev mode !!",
+                    "In dev mode eXpansion is not stable and will leak memory which will cause crash.",
+                    "This is normal behaviour. Please use prod mode. ",
+                    "",
+                    "If you are currently developing please ignore this message.",
+                ]
+            );
+            $this->chatNotification->sendMessage("{warning} eXpansion is in dev mode. Memory leaks are normal.");
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/eXpansion/Framework/Core/Resources/config/plugins_dev.yml b/src/eXpansion/Framework/Core/Resources/config/plugins_dev.yml
new file mode 100644
index 00000000..ad01138d
--- /dev/null
+++ b/src/eXpansion/Framework/Core/Resources/config/plugins_dev.yml
@@ -0,0 +1,14 @@
+services:
+    _defaults:
+        autowire: true
+        autoconfigure: true
+        public: true
+
+    #
+    # Plugin to warn agains dev mode being enabled.
+    #
+    eXpansion\Framework\Core\Plugins\DevModeNotifier:
+        class: 'eXpansion\Framework\Core\Plugins\DevModeNotifier'
+        tags:
+            - {name: expansion.plugin, data_provider: exp.timer}
+
diff --git a/src/eXpansion/Framework/Core/Services/Console.php b/src/eXpansion/Framework/Core/Services/Console.php
index 414b62a5..2cf957ea 100644
--- a/src/eXpansion/Framework/Core/Services/Console.php
+++ b/src/eXpansion/Framework/Core/Services/Console.php
@@ -4,8 +4,10 @@
 
 use eXpansion\Framework\Core\Helpers\ColorConversion;
 use eXpansion\Framework\Core\Services\Application\Dispatcher;
+use Symfony\Component\Console\Input\StringInput;
 use Symfony\Component\Console\Output\NullOutput;
 use Symfony\Component\Console\Output\OutputInterface;
+use Symfony\Component\Console\Style\SymfonyStyle;
 
 /**
  * Class Console to print in the console.
@@ -50,6 +52,9 @@ class Console
     /** @var OutputInterface */
     protected $consoleOutput;
 
+    /** @var SymfonyStyle */
+    protected $sfStyleOutput;
+
     /** @var boolean Color console enabled */
     protected $colorEnabled;
     /**
@@ -78,6 +83,8 @@ public function init(OutputInterface $consoleOutput, $dispatcher)
     {
         $this->consoleOutput = $consoleOutput;
         $this->dispatcher = $dispatcher;
+
+        $this->sfStyleOutput = new SymfonyStyle(new StringInput(''), $consoleOutput);
     }
 
     /**
@@ -225,4 +232,17 @@ public function getConsoleOutput()
 
         return $this->consoleOutput;
     }
+
+    /**
+     * Get symfony style output.
+     *
+     * @return SymfonyStyle
+     */
+    public function getSfStyleOutput(): SymfonyStyle
+    {
+        if (is_null($this->sfStyleOutput)) {
+            $this->sfStyleOutput = new SymfonyStyle(new StringInput(''), new NullOutput());
+        }
+        return $this->sfStyleOutput;
+    }
 }