Why Mirror Speed Depends on Throughput and Connection Overhead, Not Just Proximity

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A developer who runs a local mirror of large open-source Windows tool repositories explains that nearby mirrors are not always fastest. Network saturation and routing can make a distant mirror with a dedicated pipe perform better. Measuring throughput requires avoiding file caching, and single-file tests miss the cost of thousands of small git objects. Each request adds connection setup delay, so concurrent downloads become important. The author describes using aria2 and a parallel download utility to speed up refreshing a large SDK mirror.

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