By definition they “crash” (or become highly unresponsive) when the traffic exceeds whatever measures are in place to deal with it. You don’t really know if those limits are being exceeded by 1% or 10000%.
Big sites like Ticketmaster know they’re going to have high demand sometimes… but it’s very very expensive to have enough capacity to deal with, I dunno, Taylor Swift’s new tour going on sale. So while they are going to deal much better with high load than a site that runs on a single server and doesn’t do anything special, they still might have problems when they get crushed under insanely high load for a short time.
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