Improving CDN server performance is key because it directly affects the speed and availability of your website or application. CDNs provide faster loading speeds and a better user experience by caching content on servers around the world. Here are some ways to help you improve the performance of your CDN server:

　　Choose a reliable CDN provider: Choose a CDN provider with rich experience and excellent performance. Well-known CDN providers such as Akamai, Cloudflare, Fastly, etc. have extensive global networks and powerful performance optimization tools.

　　Multi-location servers: Cache content on servers in multiple locations to ensure that users around the world can enjoy lower latency. Choose edge servers in different geographical locations provided by CDN providers to ensure coverage of user-dense areas.

　　Load balancing: Use load balancing technology to distribute traffic to different CDN servers. This helps prevent single points of failure and improves overall performance and availability.

　　Cache policy: Configure the appropriate cache policy to determine what content should be cached and for how long. For static resources, such as images and CSS files, you can use a long-term caching strategy, while for dynamic content, you can use a short-term caching strategy.

　　GZIP compression: Enable GZIP compression to reduce the amount of data transferred. This will make content load faster, especially for text and script files.

　　HTTP/2 support: Use a CDN server that supports the HTTP/2 protocol. HTTP/2 allows multiplexing, reducing page load times.

　　Reduce DNS lookup: To reduce DNS lookup time, you can set the TTL (time to live) of the DNS record shorter, or use the DNS resolution service of the CDN provider.

　　Optimize images: Optimize images to reduce file size and load time. Use appropriate image formats, reducing resolution and quality to suit different devices.

　　Content compression: Compress content to reduce file size. This applies to HTML, CSS and JavaScript files.

　　CDN cache refresh: Refresh the CDN cache regularly to ensure that users always get the latest content. This is very important for updating dynamic content of a website or application.

　　Security: Use the CDN provider’s security features, such as DDoS protection and web application firewall, to ensure server stability and availability.

　　Monitoring and performance analysis: Regularly monitor the performance of the CDN server, as well as user access and response times. Use performance analysis tools to identify performance bottlenecks and take appropriate action.

　　Content delivery network automation: Use CDN automation tools to manage caching policies, SSL certificate updates, and load balancing. Automation can help reduce manual errors and improve maintainability.

　　Optimize mobile experience: Ensure that the CDN server can provide a fast mobile experience, including responsive design and mobile-optimized content delivery.

　　CDN upgrades: Regularly evaluate and upgrade your CDN service to ensure you remain competitive with the latest performance optimizations and security.

　　By taking these measures, you can improve the performance of your CDN server, providing faster loading speeds and a better user experience, while ensuring high availability of your website or application.