diff --git a/hifi-src/src/assets/leistungen/hero-highlight.webp b/hifi-src/src/assets/leistungen/hero-highlight.webp
new file mode 100644
index 0000000..08c32b0
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diff --git a/hifi-src/src/assets/photos/gallery-amp-purple.webp b/hifi-src/src/assets/photos/gallery-amp-purple.webp
new file mode 100644
index 0000000..0335f0a
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diff --git a/hifi-src/src/assets/photos/gallery-dash.webp b/hifi-src/src/assets/photos/gallery-dash.webp
new file mode 100644
index 0000000..696d41a
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diff --git a/hifi-src/src/assets/photos/gallery-dash2.webp b/hifi-src/src/assets/photos/gallery-dash2.webp
new file mode 100644
index 0000000..8a85301
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diff --git a/hifi-src/src/assets/photos/gallery-rear.webp b/hifi-src/src/assets/photos/gallery-rear.webp
new file mode 100644
index 0000000..fb4a10c
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diff --git a/hifi-src/src/assets/photos/gallery-speaker.webp b/hifi-src/src/assets/photos/gallery-speaker.webp
new file mode 100644
index 0000000..33ed1ea
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diff --git a/hifi-src/src/assets/photos/gallery-subs.webp b/hifi-src/src/assets/photos/gallery-subs.webp
new file mode 100644
index 0000000..8241c9d
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diff --git a/hifi-src/src/assets/photos/hero-trunk.webp b/hifi-src/src/assets/photos/hero-trunk.webp
new file mode 100644
index 0000000..c07a723
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diff --git a/hifi-src/src/components/Footer.jsx b/hifi-src/src/components/Footer.jsx
index 57bc03d..88f6eca 100644
--- a/hifi-src/src/components/Footer.jsx
+++ b/hifi-src/src/components/Footer.jsx
@@ -66,10 +66,10 @@ export default function Footer() {
             <p className="font-semibold text-neutral-900 dark:text-white">{t('footer.contactHeading')}</p>
           </div>
           <p>
-            <a href={`tel:${digitsOnly(phone)}`} className="hover:text-brand-500">{phone}</a>
+            <a href={`tel:${digitsOnly(phone)}`} className="inline-block py-1 hover:text-brand-500">{phone}</a>
           </p>
           <p>
-            <a href={`mailto:${contactEmail}`} className="hover:text-brand-500">{contactEmail}</a>
+            <a href={`mailto:${contactEmail}`} className="inline-block py-1 hover:text-brand-500">{contactEmail}</a>
           </p>
           <Link
             to="/kontakt"
diff --git a/hifi-src/src/context/AuthContext.jsx b/hifi-src/src/context/AuthContext.jsx
index 90de03e..ff959ce 100644
--- a/hifi-src/src/context/AuthContext.jsx
+++ b/hifi-src/src/context/AuthContext.jsx
@@ -10,7 +10,7 @@ export function AuthProvider({ children }) {
   useEffect(() => {
     api
       .get('/auth/me')
-      .then(setUser)
+      .then((data) => setUser(data.authenticated === false ? null : data))
       .catch(() => setUser(null))
       .finally(() => setLoading(false));
   }, []);
@@ -36,7 +36,7 @@ export function AuthProvider({ children }) {
 
   const refreshUser = async () => {
     const data = await api.get('/auth/me');
-    setUser(data);
+    setUser(data.authenticated === false ? null : data);
   };
 
   const hasPermission = (permission) =>
diff --git a/hifi-src/src/pages/public/ContactPage.jsx b/hifi-src/src/pages/public/ContactPage.jsx
index b6fce9b..883ebe1 100644
--- a/hifi-src/src/pages/public/ContactPage.jsx
+++ b/hifi-src/src/pages/public/ContactPage.jsx
@@ -212,11 +212,11 @@ export default function ContactPage() {
               </div>
               <div>
                 <dt className="font-medium text-neutral-800 dark:text-neutral-100">{t('contactPage.phone')}</dt>
-                <dd><a href={`tel:${digitsOnly(phone)}`} className="hover:text-brand-500">{phone}</a></dd>
+                <dd><a href={`tel:${digitsOnly(phone)}`} className="inline-block py-1 hover:text-brand-500">{phone}</a></dd>
               </div>
               <div>
                 <dt className="font-medium text-neutral-800 dark:text-neutral-100">{t('contactPage.email')}</dt>
-                <dd><a href={`mailto:${contactEmail}`} className="hover:text-brand-500">{contactEmail}</a></dd>
+                <dd><a href={`mailto:${contactEmail}`} className="inline-block py-1 hover:text-brand-500">{contactEmail}</a></dd>
               </div>
               <div>
                 <dt className="font-medium text-neutral-800 dark:text-neutral-100">{t('contactPage.hours')}</dt>
diff --git a/hifi-src/src/pages/public/Home.jsx b/hifi-src/src/pages/public/Home.jsx
index 3800495..2845435 100644
--- a/hifi-src/src/pages/public/Home.jsx
+++ b/hifi-src/src/pages/public/Home.jsx
@@ -8,14 +8,14 @@ import StarRating from '../../components/StarRating.jsx';
 import TestimonialSlider from '../../components/TestimonialSlider.jsx';
 import { useSiteSettings } from '../../context/SiteSettingsContext.jsx';
 import { useLanguage } from '../../context/LanguageContext.jsx';
-import defaultHeroImage from '../../assets/photos/gallery-dash2.jpg';
-import galleryAmp from '../../assets/photos/gallery-amp-purple.jpg';
-import gallerySpeaker from '../../assets/photos/gallery-speaker.jpg';
-import gallerySubs from '../../assets/photos/gallery-subs.jpg';
-import galleryDash from '../../assets/photos/gallery-dash.jpg';
-import galleryTrunk from '../../assets/photos/hero-trunk.jpg';
-import galleryRear from '../../assets/photos/gallery-rear.jpg';
-import heroHighlight from '../../assets/leistungen/hero-highlight.jpg';
+import defaultHeroImage from '../../assets/photos/gallery-dash2.webp';
+import galleryAmp from '../../assets/photos/gallery-amp-purple.webp';
+import gallerySpeaker from '../../assets/photos/gallery-speaker.webp';
+import gallerySubs from '../../assets/photos/gallery-subs.webp';
+import galleryDash from '../../assets/photos/gallery-dash.webp';
+import galleryTrunk from '../../assets/photos/hero-trunk.webp';
+import galleryRear from '../../assets/photos/gallery-rear.webp';
+import heroHighlight from '../../assets/leistungen/hero-highlight.webp';
 import youtubeVideo from '../../assets/videos/youtube-hintergrund.mp4';
 
 const YOUTUBE_URL = 'https://www.youtube.com/@hifiplanet2812';
@@ -23,7 +23,18 @@ const YOUTUBE_VIDEO_ID = 'ostj2mKDVUc';
 
 const brands = ['Focal', 'Helix', 'Ground Zero', 'Mosconi', 'Hifonics', 'Audison'];
 
-const galleryImages = [gallerySubs, galleryAmp, gallerySpeaker, galleryDash, galleryRear, galleryTrunk];
+// Native Pixelmasse der Bilder unten - nur fuer die width/height-Attribute auf <img>,
+// damit der Browser vor dem Laden Platz reserviert (verhindert Layout-Sprung). Die
+// tatsaechliche Anzeigegroesse wird weiterhin komplett per CSS (aspect-square etc.)
+// bestimmt, diese Werte muessen also nicht exakt zum gerenderten Seitenverhaeltnis passen.
+const galleryImages = [
+  { src: gallerySubs, width: 900, height: 600 },
+  { src: galleryAmp, width: 900, height: 600 },
+  { src: gallerySpeaker, width: 900, height: 1200 },
+  { src: galleryDash, width: 900, height: 814 },
+  { src: galleryRear, width: 900, height: 1200 },
+  { src: galleryTrunk, width: 1920, height: 1280 },
+];
 
 export default function Home() {
   const { hero_image_path: heroImagePath } = useSiteSettings();
@@ -33,7 +44,7 @@ export default function Home() {
   const stats = t('home.stats');
   const steps = t('home.steps');
   const galleryAlts = t('home.galleryAlts');
-  const gallery = galleryImages.map((src, i) => ({ src, alt: galleryAlts[i] }));
+  const gallery = galleryImages.map((img, i) => ({ ...img, alt: galleryAlts[i] }));
   const testimonials = t('home.testimonials');
   const faqs = t('home.faqs');
 
@@ -221,7 +232,14 @@ export default function Home() {
         <div className="mx-auto max-w-6xl space-y-16 overflow-hidden px-4 sm:px-6">
           <div className="grid items-center gap-8 md:grid-cols-2">
             <Reveal direction="left" shine className="rounded-xl shadow-lg">
-              <img src={gallerySubs} alt={t('home.craftImageAlt')} className="w-full rounded-xl object-cover" style={{ maxHeight: 380 }} />
+              <img
+                src={gallerySubs}
+                alt={t('home.craftImageAlt')}
+                width={900}
+                height={600}
+                className="w-full rounded-xl object-cover"
+                style={{ maxHeight: 380 }}
+              />
             </Reveal>
             <Reveal direction="right" index={1}>
               <p className="mb-2 text-sm font-semibold uppercase tracking-wide text-brand-600 dark:text-brand-400">{t('home.craftEyebrow')}</p>
@@ -241,7 +259,14 @@ export default function Home() {
               </p>
             </Reveal>
             <Reveal direction="right" index={1} shine className="order-1 md:order-2 rounded-xl shadow-lg">
-              <img src={galleryAmp} alt={t('home.adviceImageAlt')} className="w-full rounded-xl object-cover" style={{ maxHeight: 380 }} />
+              <img
+                src={galleryAmp}
+                alt={t('home.adviceImageAlt')}
+                width={900}
+                height={600}
+                className="w-full rounded-xl object-cover"
+                style={{ maxHeight: 380 }}
+              />
             </Reveal>
           </div>
         </div>
@@ -257,7 +282,14 @@ export default function Home() {
         <div className="grid grid-cols-2 gap-3 sm:grid-cols-3">
           {gallery.map((img, i) => (
             <Reveal key={img.src} index={i % 3} shine className="aspect-square overflow-hidden rounded-xl border border-neutral-200 dark:border-neutral-800">
-              <img src={img.src} alt={img.alt} loading="lazy" className="h-full w-full object-cover transition duration-300 hover:scale-105" />
+              <img
+                src={img.src}
+                alt={img.alt}
+                width={img.width}
+                height={img.height}
+                loading="lazy"
+                className="h-full w-full object-cover transition duration-300 hover:scale-105"
+              />
             </Reveal>
           ))}
         </div>
@@ -289,7 +321,14 @@ export default function Home() {
       <section className="mx-auto max-w-6xl overflow-hidden px-4 py-16 sm:px-6">
         <div className="grid items-center gap-10 md:grid-cols-2">
           <Reveal direction="left" shine className="overflow-hidden rounded-xl shadow-lg">
-            <img src={heroHighlight} alt={t('home.moreImageAlt')} className="h-full w-full object-cover" loading="lazy" />
+            <img
+              src={heroHighlight}
+              alt={t('home.moreImageAlt')}
+              width={1600}
+              height={905}
+              className="h-full w-full object-cover"
+              loading="lazy"
+            />
           </Reveal>
           <Reveal direction="right" index={1} className="text-center md:text-left">
             <h2 className="mb-3 text-2xl font-bold text-neutral-900 dark:text-white">{t('home.moreTitle')}</h2>
diff --git a/hifi/.htaccess b/hifi/.htaccess
index 4efb384..52d6f9c 100644
--- a/hifi/.htaccess
+++ b/hifi/.htaccess
@@ -1,6 +1,20 @@
 RewriteEngine On
 RewriteBase /
 
+# Lang-lebiger Cache fuer gehashte Build-Assets (Vite haengt bei jeder Aenderung einen
+# neuen Hash an den Dateinamen) und hochgeladene Bilder (bekommen beim Upload einen
+# zufaelligen Dateinamen) - beide aendern sich unter derselben URL nie, "immutable" ist
+# hier also sicher. Ueber mod_headers statt mod_expires, da Letzteres nicht ueberall
+# aktiviert ist.
+<IfModule mod_headers.c>
+  <FilesMatch "\.(js|css|woff2?|ttf|eot)$">
+    Header set Cache-Control "public, max-age=31536000, immutable"
+  </FilesMatch>
+  <FilesMatch "\.(jpg|jpeg|png|webp|avif|gif|svg|ico|mp4|webm)$">
+    Header set Cache-Control "public, max-age=31536000, immutable"
+  </FilesMatch>
+</IfModule>
+
 # Ohne dies leitet Apache (mod_dir) Anfragen an /api/uploads mit einem 301 auf
 # /api/uploads/ um, bevor mod_rewrite greifen kann - weil api/uploads/ als
 # echtes Verzeichnis existiert. Bei einem POST mit Datei-Upload geht dabei der
diff --git a/hifi/api/src/Controllers/AuthController.php b/hifi/api/src/Controllers/AuthController.php
index a28b72a..8eb294e 100644
--- a/hifi/api/src/Controllers/AuthController.php
+++ b/hifi/api/src/Controllers/AuthController.php
@@ -154,8 +154,12 @@ class AuthController
 
     public static function me(): void
     {
+        // Bewusst kein 401 hier: /auth/me wird auf JEDER oeffentlichen Seite aufgerufen,
+        // um den Login-Status zu pruefen - "nicht angemeldet" ist der Normalfall fuer
+        // Besucher, kein Fehler. Ein 401 erzeugt in der Browser-Konsole/DevTools trotz
+        // JS-seitigem catch() einen sichtbaren Netzwerk-Fehler (bemaengelt u.a. Lighthouse).
         if (empty($_SESSION['admin_id'])) {
-            Http::error('Nicht angemeldet', 401);
+            Http::send(['authenticated' => false]);
         }
         Http::send(self::userPayload((int) $_SESSION['admin_id'], $_SESSION['admin_username']));
     }