diff --git a/Inc/adsense-placement.php b/Inc/adsense-placement.php
index 640c2d73..a7f78ca1 100644
--- a/Inc/adsense-placement.php
+++ b/Inc/adsense-placement.php
@@ -5,7 +5,6 @@
  * Funciones para usar en templates:
  * - roi_render_ad_slot('post-top')
  * - roi_render_rail_ads() - Para los margenes laterales del viewport
- * - roi_should_disable_auto_ads()
  */
 
 if (!defined('ABSPATH')) {
@@ -131,35 +130,8 @@ add_action('wp_footer', function() {
     echo roi_render_rail_ads();
 }, 50);
 
-/**
- * Verifica si se debe deshabilitar Auto Ads
- */
-function roi_should_disable_auto_ads(): bool
-{
-    global $container;
-
-    if ($container === null) {
-        return false;
-    }
-
-    try {
-        $repository = $container->getComponentSettingsRepository();
-        $settings = $repository->getComponentSettings('adsense-placement');
-
-        $isEnabled = ($settings['visibility']['is_enabled'] ?? false) === true;
-        $disableAutoAds = ($settings['visibility']['disable_auto_ads'] ?? true) === true;
-
-        return $isEnabled && $disableAutoAds;
-    } catch (\Throwable $e) {
-        return false;
-    }
-}
-
 /**
  * Carga el script principal de AdSense
- *
- * IMPORTANTE: Si disable_auto_ads está activo, se añade código para
- * deshabilitar Auto Ads (page-level ads) de Google.
  */
 function roi_enqueue_adsense_script(): void
 {
@@ -183,25 +155,13 @@ function roi_enqueue_adsense_script(): void
         }
 
         $delayEnabled = ($settings['forms']['delay_enabled'] ?? true) === true;
-        $disableAutoAds = ($settings['visibility']['disable_auto_ads'] ?? true) === true;
 
-        // Script principal de AdSense
         if ($delayEnabled) {
             echo '<script type="text/plain" data-adsense-script async src="https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js?client=' . esc_attr($publisherId) . '" crossorigin="anonymous"></script>' . "\n";
         } else {
             echo '<script async src="https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js?client=' . esc_attr($publisherId) . '" crossorigin="anonymous"></script>' . "\n";
         }
 
-        // Deshabilitar Auto Ads (page-level ads) si está configurado
-        if ($disableAutoAds) {
-            echo '<script>
-(adsbygoogle = window.adsbygoogle || []).push({
-    google_ad_client: "' . esc_js($publisherId) . '",
-    enable_page_level_ads: false
-});
-</script>' . "\n";
-        }
-
     } catch (\Throwable $e) {
         if (defined('WP_DEBUG') && WP_DEBUG) {
             error_log('ROI AdSense: ' . $e->getMessage());
diff --git a/Inc/enqueue-scripts.php b/Inc/enqueue-scripts.php
index 9361a55c..87a1b1cf 100644
--- a/Inc/enqueue-scripts.php
+++ b/Inc/enqueue-scripts.php
@@ -11,6 +11,56 @@ if (!defined('ABSPATH')) {
     exit;
 }
 
+/**
+ * CSS no críticos que se cargarán de forma diferida (Fase 4.2 PageSpeed)
+ *
+ * Estos CSS se cargan con media="print" y onload="this.media='all'"
+ * para evitar bloquear el renderizado inicial.
+ *
+ * @since 1.0.21
+ */
+define('ROI_DEFERRED_CSS', [
+    'roi-badges',
+    'roi-pagination',
+    'roi-generic-tables',
+    'roi-video',
+    'roi-animations',
+    'roi-youtube-facade',
+    'roi-tables-apu',
+]);
+
+/**
+ * Add async loading to deferred stylesheets (Fase 4.2 PageSpeed)
+ *
+ * Converts media="print" to media="all" after load to prevent render-blocking.
+ *
+ * @since 1.0.21
+ * @param string $html   The link tag HTML.
+ * @param string $handle The stylesheet handle.
+ * @return string Modified link tag.
+ */
+function roi_add_deferred_css_onload($html, $handle) {
+    if (!in_array($handle, ROI_DEFERRED_CSS, true)) {
+        return $html;
+    }
+
+    // Add onload attribute to switch media to "all" after load
+    $html = str_replace(
+        "media='print'",
+        "media='print' onload=\"this.media='all'\"",
+        $html
+    );
+
+    // Add noscript fallback for users without JavaScript
+    $href = preg_match('/href=[\'"]([^\'"]+)[\'"]/', $html, $matches) ? $matches[1] : '';
+    if ($href) {
+        $html .= '<noscript><link rel="stylesheet" href="' . esc_url($href) . '"></noscript>' . "\n";
+    }
+
+    return $html;
+}
+add_filter('style_loader_tag', 'roi_add_deferred_css_onload', 10, 2);
+
 /**
  * Enqueue typography system
  *
@@ -113,21 +163,23 @@ function roi_enqueue_fase2_styles() {
     // @see Public/Hero/Infrastructure/Ui/HeroRenderer.php
 
     // Category Badges CSS - Clase genérica (Issue #62)
+    // DIFERIDO: Fase 4.2 PageSpeed - media='print' + onload
     wp_enqueue_style(
         'roi-badges',
         get_template_directory_uri() . '/Assets/css/css-global-badges.css',
         array('roi-bootstrap'),
         filemtime(get_template_directory() . '/Assets/css/css-global-badges.css'),
-        'all'
+        'print' // Diferido para no bloquear renderizado
     );
 
     // Pagination CSS - Estilos personalizados (Issue #64)
+    // DIFERIDO: Fase 4.2 PageSpeed - below the fold
     wp_enqueue_style(
         'roi-pagination',
         get_template_directory_uri() . '/Assets/css/css-global-pagination.css',
         array('roi-bootstrap'),
         filemtime(get_template_directory() . '/Assets/css/css-global-pagination.css'),
-        'all'
+        'print' // Diferido para no bloquear renderizado
     );
 
     // Post Content Typography y Related Posts - DESHABILITADOS
@@ -232,12 +284,13 @@ function roi_enqueue_generic_tables() {
     }
 
     // Generic Tables CSS
+    // DIFERIDO: Fase 4.2 PageSpeed - below the fold
     wp_enqueue_style(
         'roi-generic-tables',
         get_template_directory_uri() . '/Assets/css/css-global-generic-tables.css',
         array('roi-bootstrap'),
         ROI_VERSION,
-        'all'
+        'print' // Diferido para no bloquear renderizado
     );
 }
 
@@ -256,12 +309,13 @@ function roi_enqueue_video_styles() {
     }
 
     // Video CSS
+    // DIFERIDO: Fase 4.2 PageSpeed - below the fold
     wp_enqueue_style(
         'roi-video',
         get_template_directory_uri() . '/Assets/css/css-global-video.css',
         array('roi-bootstrap'),
         ROI_VERSION,
-        'all'
+        'print' // Diferido para no bloquear renderizado
     );
 }
 
@@ -307,10 +361,11 @@ add_action('wp_enqueue_scripts', 'roi_enqueue_main_javascript', 11);
  */
 function roi_enqueue_accessibility() {
     // Accessibility CSS
+    // CORREGIDO: Fase 4.2 PageSpeed - dependencia 'roi-theme-style' no existía
     wp_enqueue_style(
         'roi-accessibility',
         get_template_directory_uri() . '/Assets/css/css-global-accessibility.css',
-        array('roi-theme-style'),
+        array('roi-main-style'), // Corregido: 'roi-theme-style' -> 'roi-main-style'
         ROI_VERSION,
         'all'
     );
@@ -384,12 +439,13 @@ function roi_enqueue_theme_styles() {
     // );
 
     // Theme Animations
+    // DIFERIDO: Fase 4.2 PageSpeed - mejoras visuales no críticas
     wp_enqueue_style(
         'roi-animations',
         get_template_directory_uri() . '/Assets/css/css-global-animations.css',
-        array('roi-bootstrap'), // Cambiado de 'roi-theme' a 'roi-bootstrap'
+        array('roi-bootstrap'),
         '1.0.0',
-        'all'
+        'print' // Diferido para no bloquear renderizado
     );
 
     // Theme Responsive Styles
@@ -436,12 +492,13 @@ add_action('wp_enqueue_scripts', 'roi_enqueue_theme_styles', 13);
  */
 function roi_enqueue_apu_tables_styles() {
     // APU Tables CSS
+    // DIFERIDO: Fase 4.2 PageSpeed - below the fold
     wp_enqueue_style(
         'roi-tables-apu',
         get_template_directory_uri() . '/Assets/css/css-tablas-apu.css',
         array('roi-bootstrap'),
         ROI_VERSION,
-        'all'
+        'print' // Diferido para no bloquear renderizado
     );
 }
 
diff --git a/Public/YoutubeFacade/Infrastructure/Wordpress/YoutubeFacadeHooksRegistrar.php b/Public/YoutubeFacade/Infrastructure/Wordpress/YoutubeFacadeHooksRegistrar.php
index 2c39e56e..b854c745 100644
--- a/Public/YoutubeFacade/Infrastructure/Wordpress/YoutubeFacadeHooksRegistrar.php
+++ b/Public/YoutubeFacade/Infrastructure/Wordpress/YoutubeFacadeHooksRegistrar.php
@@ -50,12 +50,13 @@ final class YoutubeFacadeHooksRegistrar
             return;
         }
 
+        // DIFERIDO: Fase 4.2 PageSpeed - below the fold
         wp_enqueue_style(
             'roi-youtube-facade',
             get_template_directory_uri() . '/Public/YoutubeFacade/Infrastructure/Ui/Assets/Css/youtube-facade.css',
             [],
             ROI_VERSION,
-            'all'
+            'print' // Diferido para no bloquear renderizado
         );
 
         wp_enqueue_script(