Store display_sidebar in static variable

lib/config.php

@@ -34,31 +34,36 @@ add_filter('body_class', 'roots_sidebar_body_class');
  * See lib/sidebar.php for more details
  */
 function roots_display_sidebar() {
-  $sidebar_config = new Roots_Sidebar(
-    /**
-     * Conditional tag checks (http://codex.wordpress.org/Conditional_Tags)
-     * Any of these conditional tags that return true won't show the sidebar
-     *
-     * To use a function that accepts arguments, use the following format:
-     *
-     * array('function_name', array('arg1', 'arg2'))
-     *
-     * The second element must be an array even if there's only 1 argument.
-     */
-    array(
-      'is_404',
-      'is_front_page'
-    ),
-    /**
-     * Page template checks (via is_page_template())
-     * Any of these page templates that return true won't show the sidebar
-     */
-    array(
-      'template-custom.php'
-    )
-  );
+  static $display;
 
-  return apply_filters('roots/display_sidebar', $sidebar_config->display);
+  if (!isset($display)) {
+    $sidebar_config = new Roots_Sidebar(
+      /**
+       * Conditional tag checks (http://codex.wordpress.org/Conditional_Tags)
+       * Any of these conditional tags that return true won't show the sidebar
+       *
+       * To use a function that accepts arguments, use the following format:
+       *
+       * array('function_name', array('arg1', 'arg2'))
+       *
+       * The second element must be an array even if there's only 1 argument.
+       */
+      array(
+        'is_404',
+        'is_front_page'
+      ),
+      /**
+       * Page template checks (via is_page_template())
+       * Any of these page templates that return true won't show the sidebar
+       */
+      array(
+        'template-custom.php'
+      )
+    );
+    $display = apply_filters('roots/display_sidebar', $sidebar_config->display);
+  }  
+
+  return $display;
 }
 
 /**