diff --git a/Dockerfile b/Dockerfile
index 88e5f30..4d4c803 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -2,6 +2,7 @@ FROM node:20-alpine
 WORKDIR /app
 COPY package.json ./
 COPY server.js ./
+COPY warm-urls.json ./
 COPY public ./public
 RUN mkdir -p /data
 ENV PORT=80
diff --git a/server.js b/server.js
index 6d4c7e6..73ff63b 100644
--- a/server.js
+++ b/server.js
@@ -125,3 +125,20 @@ const server = http.createServer(async (req, res) => {
 });
 
 server.listen(PORT, () => console.log('Reise-Vergleich läuft auf Port ' + PORT + ' | Daten: ' + DATA_FILE));
+
+// Prefetch all hotel/cruise images into the proxy cache so the first visit is instant.
+(async () => {
+  let list = [];
+  try { list = JSON.parse(fs.readFileSync(path.join(__dirname, 'warm-urls.json'), 'utf8')); }
+  catch (e) { return; }
+  for (const u of list) {
+    try {
+      const host = new URL(u).host;
+      if (!hostAllowed(host) || imgCache.has(u)) continue;
+      const referer = host.endsWith('ahoi-schiff.de') ? 'https://www.ahoi-schiff.de/' : 'https://urlaub.check24.de/';
+      const r = await fetch(u, { headers: { 'Referer': referer, 'User-Agent': 'Mozilla/5.0 (compatible; HeidrichReise/1.0)', 'Accept': 'image/*' } });
+      if (r.ok) imgCache.set(u, { buf: Buffer.from(await r.arrayBuffer()), type: r.headers.get('content-type') || 'image/jpeg' });
+    } catch (e) { /* skip */ }
+  }
+  console.log('Bild-Cache vorgewärmt:', imgCache.size + '/' + list.length);
+})();
diff --git a/warm-urls.json b/warm-urls.json
new file mode 100644
index 0000000..5ded804
--- /dev/null
+++ b/warm-urls.json
@@ -0,0 +1,17 @@
+[
+"https://cdn1.urlaub.check24.de/size=625c440/di=3/nfc=200/source=aHR0cHM6Ly9pLnRyYXZlbGFwaS5jb20vbG9kZ2luZy8zNDAwMDAwMC8zMzYzMDAwMC8zMzYyNTkwMC8zMzYyNTg1OC9iM2EyNzQxY193LmpwZw==!07717e/picture.jpg",
+"https://cdn1.urlaub.check24.de/size=625c440/di=3/nfc=200/source=aHR0cHM6Ly9ob3RlbGltYWdlcy5zdW5ob3RlbHMubmV0L0hvdGVsSW5mby9ob3RlbEltYWdlLmFzcHg-aWQ9MTYxODE3MjUmZnVsbD0x!cc720d/picture.jpg",
+"https://cdn1.urlaub.check24.de/size=625c440/di=3/nfc=200/source=aHR0cDovL3Bob3Rvcy5ob3RlbGJlZHMuY29tL2dpYXRhL29yaWdpbmFsLzI1LzI1MzUxOS8yNTM1MTlhX2hiX3NfMDA1LmpwZw==!a9bbf6/picture.jpg",
+"https://cdn1.urlaub.check24.de/size=625c440/di=3/nfc=200/source=aHR0cHM6Ly9pLnRyYXZlbGFwaS5jb20vbG9kZ2luZy84MDAwMDAwLzc3MDAwMDAvNzY5NzYwMC83Njk3NTMxLzhkMDY0YTM3X3cuanBn!7c92d2/picture.jpg",
+"https://cdn1.urlaub.check24.de/size=625c440/di=3/nfc=200/source=aHR0cDovL21lZGlhLmRldi5wYXhpbXVtLmNvbS9ob3RlbGltYWdlcy8yNzA0MTgvNDcuanBn!8c2535/picture.jpg",
+"https://cdn1.urlaub.check24.de/size=625c440/di=3/nfc=200/source=aHR0cHM6Ly9pLnRyYXZlbGFwaS5jb20vbG9kZ2luZy8zMDAwMDAwLzI4MjAwMDAvMjgxNDUwMC8yODE0NDA5LzZjYjI4NzAwX3cuanBn!774551/picture.jpg",
+"https://cdn1.urlaub.check24.de/size=625c440/di=3/nfc=200/source=aHR0cHM6Ly9hcGktaW1nLmhvdGVsc3Rvbi5jb20vcmVzb3VyY2UvaG90ZWwvaW1hZ2VzLzcvMy84LzMvNy8yLzYvMy8xMDMxMzQzNTY0LmpwZw==!9db0ac/picture.jpg",
+"https://cdn1.urlaub.check24.de/size=625c440/di=3/nfc=200/source=aHR0cHM6Ly9pLnRyYXZlbGFwaS5jb20vbG9kZ2luZy85MDAwMDAwLzgxNjAwMDAvODE1ODAwMC84MTU3OTc5LzRjNjE3OTlkX3cuanBn!55230f/picture.jpg",
+"https://cdn1.urlaub.check24.de/size=625c440/di=3/nfc=200/source=aHR0cDovL21lZGlhLmRldi5wYXhpbXVtLmNvbS9ob3RlbGltYWdlcy8yMjY0NTYvZDFhYzA3MGQ0OTg1Zjg3ZmI4YjM5OTA2MzAxNTMzZGQuanBn!c32a55/picture.jpg",
+"https://cdn1.urlaub.check24.de/size=625c440/di=3/nfc=200/source=aHR0cDovL3Bob3Rvcy5ob3RlbGJlZHMuY29tL2dpYXRhL29yaWdpbmFsLzAwLzAwMTEzNi8wMDExMzZhX2hiX3RfMDExLmpwZw==!e1aee2/picture.jpg",
+"https://cdn1.urlaub.check24.de/size=625c440/di=3/nfc=200/source=aHR0cHM6Ly9pLnRyYXZlbGFwaS5jb20vbG9kZ2luZy81MDAwMDAwLzQ4MjAwMDAvNDgxMzQwMC80ODEzMzUxL2Y4ZjNkYTE3X3cuanBn!cb047b/picture.jpg",
+"https://cdn1.urlaub.check24.de/size=625c440/di=3/nfc=200/source=aHR0cDovL3Bob3Rvcy5ob3RlbGJlZHMuY29tL2dpYXRhL29yaWdpbmFsLzAwLzAwNTUyOS8wMDU1MjlhX2hiX2FfMDIzLmpwZw==!406b07/picture.jpg",
+"https://cdn1.urlaub.check24.de/size=625c440/di=3/nfc=200/source=aHR0cHM6Ly9pLnRyYXZlbGFwaS5jb20vbG9kZ2luZy83MDAwMDAwLzYxNTAwMDAvNjE0MTgwMC82MTQxNzIzLzI5YmZiMjE0X3cuanBn!da02c7/picture.jpg",
+"https://cdn1.urlaub.check24.de/size=625c440/di=3/nfc=200/source=aHR0cHM6Ly9pLnRyYXZlbGFwaS5jb20vbG9kZ2luZy8xMDAwMDAwLzkzMDAwMC85MjI0MDAvOTIyMzE5Lzg3YjE3ODc3X3ouanBn!d36a31/picture.jpg",
+"https://files.ahoi-schiff.de/aida-cruises/s/aidacosma.webp"
+]
\ No newline at end of file