Configure Compression To more efficiently use available bandwidth, it is advisable to enable IIS's HTTP compression feature. HTTP compression provides faster transmission time between compression-enabled browsers and IIS regardless of whether your content is served from local storage or a UNC resource. You can compress static files only, application response files only, or both static files and application response files. Compressing application response files is usually called dynamic compression. By default, enabling static file compression compresses .htm, .html, and .txt files. Enabling dynamic compression compresses .asp, .dll, and .exe files. You can customize the file types that are compressed. Enabling compression of static files in IIS always results in more efficient utilization of bandwidth and faster Web site performance. Enabling dynamic compression always results in more efficient utilization of bandwidth, but if your server's processor utilization is already extremely high, the CPU load imposed by dynamic compression might make your site perform more slowly. If you already have a network-based compression solution installed, enabling compression in IIS might not result in bandwidth utilization or performance improvements, depending on whether the network-based compression and IIS-based compression are redundant.
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