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How stable is the CDN when the each node lifetime is 5 minutes? The likelihood of an ongoing request being cut off is fairly high. Nodes are also constantly in syncing state I assume.

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Very! The lifetime of nodes is actually quite a bit longer than 5 minutes as the tab doesn't need to be foregrounded (which Google Analytics and others report as the end of the 'session'). That, and when a node comes online, it joins the network with the cache contents it had filled previously. So it joins the network warm, not cold and needing to be filled.

Interesting.

Is the cache shared between all the websites that install this product?

What happens to a HTTP request to a browser whenever they close their tab, is it retried on another browser?

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