Content Delivery Network. Basically, traffic is automatically directed to local caching and/or mirroring proxies. You might have heard of Cloudflare? They're a king in that industry.

In reply to Re^3: Released modules sometimes newer on metacpan.org than on cpan.org?! by ikegami
in thread Released modules sometimes newer on metacpan.org than on cpan.org?! by Intrepid

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