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〖Two〗、After establishing a robust application pool, the next critical dimension of IIS7 performance tuning revolves around caching and compression, which directly reduce server load and bandwidth consumption. Start by enabling “Output Caching” at the site or application level—identify static resources such as images, CSS, JavaScript, and HTML pages that change infrequently, and set appropriate cache profiles with expiration policies (e.g., Cache-Control: public, max-age=86400). IIS7’s kernel-mode caching is particularly potent; it caches responses in HTTP.sys, bypassing user-mode processing entirely. Enable this by setting “Enable Kernel Cache” to true and specifying cache rules for common extensions. For dynamic content that is rarely updated per user, consider using “User Mode Cache” with varying by query string or HTTP headers. Additionally, leverage “Compression” to shrink response sizes—IIS7 supports both static and dynamic compression. Under the “Compression” module, enable “Enable static content compression” and “Enable dynamic content compression”. For dynamic compression, be cautious with CPU overhead; typically, compress responses larger than 2560 bytes and exclude image files already compressed. Adjust the compression level to balance CPU usage versus bandwidth savings—level 4 to 6 is a sweet spot for most servers. Also, ensure that the “Expires” and “Cache-Control” headers are correctly set for static resources via the “HTTP Response Headers” setting. A well-crafted caching strategy reduces repeat requests to the server by 40–70%, while compression can shrink data transfer by up to 90% for text-based responses. Combine these techniques with “Content Expiration” policies in the “Output Caching” feature, and you will notice immediate improvements in page load times and server resource utilization. Moreover, don’t overlook “HTTP Keep-Alive” settings—enable keep-alive with a timeout of 10–30 seconds to reuse TCP connections, reducing the overhead of handshakes for multiple resource requests from the same client.