diff --git a/client/src/components/ad-explanation.tsx b/client/src/components/ad-explanation.tsx
new file mode 100644
index 0000000..6d46dd1
--- /dev/null
+++ b/client/src/components/ad-explanation.tsx
@@ -0,0 +1,80 @@
+import { useState } from "react";
+import { Button } from "@/components/ui/button";
+import { Dialog, DialogContent, DialogHeader, DialogTitle } from "@/components/ui/dialog";
+import { Info, DollarSign, PlayCircle, Eye } from "lucide-react";
+
+interface AdExplanationProps {
+  isOpen: boolean;
+  onClose: () => void;
+}
+
+export default function AdExplanation({ isOpen, onClose }: AdExplanationProps) {
+  return (
+    <Dialog open={isOpen} onOpenChange={onClose}>
+      <DialogContent className="bg-gray-800 border-gray-700 text-white max-w-2xl">
+        <DialogHeader>
+          <DialogTitle className="text-xl font-bold flex items-center gap-2">
+            <DollarSign className="w-6 h-6 text-yellow-500" />
+            Kaj pomenijo oznake "💰 OGLAS"?
+          </DialogTitle>
+        </DialogHeader>
+        
+        <div className="space-y-6 py-4">
+          <div className="bg-yellow-500/10 border border-yellow-500/20 rounded-lg p-4">
+            <div className="flex items-center gap-2 mb-2">
+              <div className="bg-gradient-to-r from-yellow-500 to-orange-500 text-white text-xs px-2 py-1 rounded-full font-bold">
+                💰 OGLAS
+              </div>
+              <span className="text-yellow-300 font-medium">Monetizirani videji</span>
+            </div>
+            <p className="text-sm text-gray-300">
+              Te oznake prikazujejo, da so videji opremljeni z naprednim VAST oglasnim sistemom
+            </p>
+          </div>
+          
+          <div className="grid grid-cols-1 md:grid-cols-2 gap-4">
+            <div className="bg-gray-700/50 rounded-lg p-4">
+              <div className="flex items-center gap-2 mb-2">
+                <PlayCircle className="w-5 h-5 text-blue-400" />
+                <h3 className="font-medium">Kako deluje?</h3>
+              </div>
+              <p className="text-sm text-gray-300">
+                Pred ali med predvajanjem videa se prikazujejo oglasi, ki omogočajo brezplačno gledanje vsebine
+              </p>
+            </div>
+            
+            <div className="bg-gray-700/50 rounded-lg p-4">
+              <div className="flex items-center gap-2 mb-2">
+                <Eye className="w-5 h-5 text-green-400" />
+                <h3 className="font-medium">Brezplačno gledanje</h3>
+              </div>
+              <p className="text-sm text-gray-300">
+                Oglasi omogočajo, da lahko vse videji gledate povsem brezplačno brez naročnine
+              </p>
+            </div>
+          </div>
+          
+          <div className="bg-blue-500/10 border border-blue-500/20 rounded-lg p-4">
+            <h3 className="font-medium text-blue-300 mb-2">VAST oglasni sistem</h3>
+            <p className="text-sm text-gray-300 mb-2">
+              Platforma uporablja profesionalni VAST (Video Ad Serving Template) sistem z 5 oglasnimi mrežami:
+            </p>
+            <ul className="text-sm text-gray-300 space-y-1">
+              <li>• Publift - Agregator več oglaševalskih omrežij</li>
+              <li>• Vdo.ai - AI ciljanje z visokim eCPM</li>
+              <li>• Primis - Video discovery platforma</li>
+              <li>• AdPlayer.Pro - Outstream rešitve</li>
+              <li>• Aniview - Programmatic oglasne tehnologije</li>
+            </ul>
+          </div>
+          
+          <div className="flex justify-end">
+            <Button onClick={onClose} className="bg-bunny-blue hover:bg-blue-600">
+              Razumem
+            </Button>
+          </div>
+        </div>
+      </DialogContent>
+    </Dialog>
+  );
+}
\ No newline at end of file
diff --git a/client/src/components/search-header.tsx b/client/src/components/search-header.tsx
index 53c4978..96a661c 100644
--- a/client/src/components/search-header.tsx
+++ b/client/src/components/search-header.tsx
@@ -1,5 +1,5 @@
 import { useState } from "react";
-import { Search, Play, Menu, Grid3X3, List, DollarSign, Settings } from "lucide-react";
+import { Search, Play, Menu, Grid3X3, List, DollarSign, Settings, Info } from "lucide-react";
 import { Input } from "@/components/ui/input";
 import { Button } from "@/components/ui/button";
 import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from "@/components/ui/select";
@@ -9,13 +9,15 @@ interface SearchHeaderProps {
   onViewChange: (view: "grid" | "list") => void;
   currentView: "grid" | "list";
   onAdSettingsOpen?: () => void;
+  onAdExplanationOpen?: () => void;
 }
 
 export default function SearchHeader({
   onSearch,
   onViewChange,
   currentView,
-  onAdSettingsOpen
+  onAdSettingsOpen,
+  onAdExplanationOpen
 }: SearchHeaderProps) {
   const [searchQuery, setSearchQuery] = useState("");
 
diff --git a/client/src/components/video-card.tsx b/client/src/components/video-card.tsx
index 058e7b2..2c7d318 100644
--- a/client/src/components/video-card.tsx
+++ b/client/src/components/video-card.tsx
@@ -56,6 +56,8 @@ export default function VideoCard({ video, onClick }: VideoCardProps) {
           alt={video.title}
           className="w-full h-full object-cover transition-all duration-300 group-hover:scale-105"
           data-testid={`img-thumbnail-${video.id}`}
+          loading="lazy"
+          decoding="async"
           onError={(e) => {
             const target = e.target as HTMLImageElement;
             target.style.display = 'none';
@@ -72,7 +74,7 @@ export default function VideoCard({ video, onClick }: VideoCardProps) {
         
         {/* VAST Ad monetization indicator */}
         <div className="absolute top-2 left-2 bg-gradient-to-r from-yellow-500 to-orange-500 text-white text-xs px-2 py-1 rounded-full font-bold shadow-lg">
-          💰 SPOT
+          💰 OGLAS
         </div>
         
         {/* Play button overlay */}
diff --git a/client/src/lib/queryClient.ts b/client/src/lib/queryClient.ts
index f315a14..52dd842 100644
--- a/client/src/lib/queryClient.ts
+++ b/client/src/lib/queryClient.ts
@@ -47,8 +47,9 @@ export const queryClient = new QueryClient({
       queryFn: getQueryFn({ on401: "throw" }),
       refetchInterval: false,
       refetchOnWindowFocus: false,
-      staleTime: Infinity,
-      retry: false,
+      staleTime: 5 * 60 * 1000, // 5 minutes cache
+      gcTime: 10 * 60 * 1000, // 10 minutes retention
+      retry: 1,
     },
     mutations: {
       retry: false,
diff --git a/client/src/pages/home.tsx b/client/src/pages/home.tsx
index 29f6d58..761a25d 100644
--- a/client/src/pages/home.tsx
+++ b/client/src/pages/home.tsx
@@ -4,6 +4,7 @@ import { type Video } from "@shared/schema";
 import SearchHeader from "@/components/search-header";
 import VideoGrid from "@/components/video-grid";
 import AdSettings from "@/components/ad-settings";
+import AdExplanation from "@/components/ad-explanation";
 
 interface VideosResponse {
   videos: Video[];
@@ -17,6 +18,7 @@ export default function Home() {
   const [offset, setOffset] = useState(0);
   const [allVideos, setAllVideos] = useState<Video[]>([]);
   const [showAdSettings, setShowAdSettings] = useState(false);
+  const [showAdExplanation, setShowAdExplanation] = useState(false);
 
   // Fetch videos
   const { data: videosResponse, isLoading, refetch } = useQuery<VideosResponse>({
@@ -77,6 +79,7 @@ export default function Home() {
         onViewChange={setViewMode}
         currentView={viewMode}
         onAdSettingsOpen={() => setShowAdSettings(true)}
+        onAdExplanationOpen={() => setShowAdExplanation(true)}
       />
 
       <main className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8 py-8">
@@ -94,6 +97,12 @@ export default function Home() {
         isOpen={showAdSettings}
         onClose={() => setShowAdSettings(false)}
       />
+      
+      {/* Ad Explanation Modal */}
+      <AdExplanation 
+        isOpen={showAdExplanation}
+        onClose={() => setShowAdExplanation(false)}
+      />
 
       {/* Footer */}
       <footer className="bg-bunny-gray/50 border-t border-gray-700 mt-16">
diff --git a/server/routes.ts b/server/routes.ts
index 3cf85bb..630c597 100644
--- a/server/routes.ts
+++ b/server/routes.ts
@@ -132,9 +132,9 @@ export async function registerRoutes(app: Express): Promise<Server> {
   // Bunny.net administration routes
   app.get("/api/bunny/stats", async (req, res) => {
     try {
-      const result = await storage.getVideos(1, 1000);
+      const result = await storage.getVideos({ limit: 1000, offset: 0 });
       const videos = result?.videos || [];
-      const totalViews = videos.length > 0 ? videos.reduce((sum, video) => sum + video.views, 0) : 0;
+      const totalViews = videos.length > 0 ? videos.reduce((sum: number, video: any) => sum + video.views, 0) : 0;
       
       const stats = {
         totalVideos: videos.length,
@@ -165,19 +165,26 @@ export async function registerRoutes(app: Express): Promise<Server> {
 
   app.get("/api/videos", async (req, res) => {
     try {
+      // Set cache headers for better performance
+      res.set({
+        'Cache-Control': 'public, max-age=300, s-maxage=300', // 5 minutes cache
+        'ETag': `"videos-${Date.now()}"`,
+        'X-Content-Type-Options': 'nosniff',
+        'X-Frame-Options': 'DENY'
+      });
+
       const limit = parseInt(req.query.limit as string) || 20;
       const offset = parseInt(req.query.offset as string) || 0;
       const search = req.query.search as string;
 
-      const videos = await storage.getVideos(limit, offset, search);
-      const total = await storage.getVideoCount(search);
-
-      res.json({
-        videos,
-        total,
-        hasMore: offset + limit < total
-      });
+      console.log(`Fetching videos: limit=${limit}, offset=${offset}, search=${search}`);
+      
+      const result = await storage.getVideos({ limit, offset, search });
+      console.log(`Returning ${result.videos.length} videos`);
+      
+      res.json(result);
     } catch (error) {
+      console.error("Error fetching videos:", error);
       res.status(500).json({ message: "Failed to fetch videos" });
     }
   });