CDN quality determines how fast IPTV streams load, how stable they remain during peak hours, and how well they perform in different regions. A provider using premium CDNs has lower latency, fewer buffering events, and better video consistency. Poor CDNs cause freezing, pixelation, and slow zapping. Glanfy evaluates providers based on CDN routing, load balancing, and global distribution, ensuring users get stable and optimized performance.