diff --git a/libs/Daux.php b/libs/Daux.php
index f113b9a..c1bef29 100644
--- a/libs/Daux.php
+++ b/libs/Daux.php
@@ -33,6 +33,12 @@ class Daux
     /** @var string */
     private $mode;
 
+    /** @var bool */
+    private $merged_defaults = false;
+
+    /** @var bool */
+    private $merged_tree = false;
+
     /**
      * @param string $mode
      */
@@ -161,20 +167,27 @@ class Daux
      */
     public function getParams()
     {
-        $default = [
-            //Features
-            'multilanguage' => !empty($this->options['languages']),
+        if (!$this->merged_defaults) {
+            $default = [
+                //Features
+                'multilanguage' => !empty($this->options['languages']),
 
-            //Paths and tree
-            'theme-name' => $this->options['theme'],
-            'mode' => $this->mode,
-            'local_base' => $this->local_base,
-            'docs_path' => $this->docs_path,
-            'templates' => $this->internal_base . DS . 'templates',
-        ];
-        $this->options->conservativeMerge($default);
+                //Paths and tree
+                'theme-name' => $this->options['theme'],
+                'mode' => $this->mode,
+                'local_base' => $this->local_base,
+                'docs_path' => $this->docs_path,
+                'templates' => $this->internal_base . DS . 'templates',
+            ];
+            $this->options->conservativeMerge($default);
 
-        if ($this->tree) {
+            $this->options['index_key'] = 'index.html';
+            $this->options['base_page'] = $this->options['base_url'] = '';
+
+            $this->merged_defaults = true;
+        }
+
+        if ($this->tree && !$this->merged_tree) {
             $this->options['tree'] = $this->tree;
             $this->options['index'] = $this->tree->getIndexPage() ?: $this->tree->getFirstPage();
             if ($this->options['multilanguage']) {
@@ -184,11 +197,9 @@ class Daux
             } else {
                 $this->options['entry_page'] = $this->tree->getFirstPage();
             }
+            $this->merged_tree = true;
         }
 
-        $this->options['index_key'] = 'index.html';
-        $this->options['base_page'] = $this->options['base_url'] = '';
-
         return $this->options;
     }
 
diff --git a/libs/DauxHelper.php b/libs/DauxHelper.php
index 53aa390..b28d1aa 100644
--- a/libs/DauxHelper.php
+++ b/libs/DauxHelper.php
@@ -4,6 +4,19 @@ use Todaymade\Daux\Tree\Directory;
 
 class DauxHelper
 {
+    public static function rebaseConfiguration(Config $config, $base_url)
+    {
+        // Avoid changing the url if it is already correct
+        if ($config['base_url'] == $base_url && !empty($config['theme']) && !is_string($config['theme'])) {
+            return;
+        }
+
+        // Change base url for all links on the pages
+        $config['base_url'] = $config['base_page'] = $base_url;
+        $config['theme'] = static::getTheme($config, $base_url);
+        $config['image'] = str_replace('<base_url>', $base_url, $config['image']);
+    }
+
     /**
      * @param Config $params
      * @param string $current_url
diff --git a/libs/Format/HTML/Generator.php b/libs/Format/HTML/Generator.php
index 6b237b0..62dab63 100644
--- a/libs/Format/HTML/Generator.php
+++ b/libs/Format/HTML/Generator.php
@@ -54,19 +54,6 @@ class Generator implements \Todaymade\Daux\Format\Base\Generator
         $this->generateRecursive($this->daux->tree, $destination, $params, $output, $width);
     }
 
-    private function rebaseConfig(Config $config, $base_url)
-    {
-        // Avoid changing the url if it is already correct
-        if ($config['base_url'] == $base_url && !empty($config['theme']) && !is_string($config['theme'])) {
-            return;
-        }
-
-        // Change base url for all links on the pages
-        $config['base_url'] = $config['base_page'] = $base_url;
-        $config['theme'] = DauxHelper::getTheme($config, $base_url);
-        $config['image'] = str_replace('<base_url>', $base_url, $config['image']);
-    }
-
     /**
      * Recursively generate the documentation
      *
@@ -80,7 +67,7 @@ class Generator implements \Todaymade\Daux\Format\Base\Generator
      */
     private function generateRecursive(Directory $tree, $output_dir, $params, $output, $width, $base_url = '')
     {
-        $this->rebaseConfig($params, $base_url);
+        DauxHelper::rebaseConfiguration($params, $base_url);
 
         if ($base_url !== '' && empty($params['entry_page'])) {
             $params['entry_page'] = $tree->getFirstPage();
@@ -93,7 +80,7 @@ class Generator implements \Todaymade\Daux\Format\Base\Generator
                 $this->generateRecursive($node, $new_output_dir, $params, $output, $width, '../' . $base_url);
 
                 // Rebase configuration again as $params is a shared object
-                $this->rebaseConfig($params, $base_url);
+                DauxHelper::rebaseConfiguration($params, $base_url);
             } else {
                 $this->runAction(
                     "- " . $node->getUrl(),
diff --git a/libs/Server/Server.php b/libs/Server/Server.php
index 9902cc0..509dec8 100644
--- a/libs/Server/Server.php
+++ b/libs/Server/Server.php
@@ -74,17 +74,13 @@ class Server
 
         $params['index_key'] = 'index';
         $params['host'] = $this->host;
-        $params['base_page'] = $params['base_url'] = '//' . $this->base_url;
+
+        DauxHelper::rebaseConfiguration($params, '//' . $this->base_url);
+        $params['base_page'] = '//' . $this->base_url;
         if (!$this->daux->options['clean_urls']) {
             $params['base_page'] .= 'index.php/';
         }
 
-        if ($params['image'] !== '') {
-            $params['image'] = str_replace('<base_url>', $params['base_url'], $params['image']);
-        }
-
-        $params['theme'] = DauxHelper::getTheme($params, $this->base_url);
-
         return $params;
     }