I struggle to say why not. I just checked and it's hosted on AWS Ireland which should have the capacity to deal with any level of traffic. I noticed that dig-i

I struggle to say why not. I just checked and it's hosted on AWS Ireland which should have the capacity to deal with any level of traffic. I noticed that dig-ing it returns two IP addresses, indicating an elastic/application load balancer is in use as opposed to a CDN. That means every request is being served off their own instances so that's not great. A CDN would certainly help; you can serve all paths from the CDN cache with a 1s TTL except the pages where you post to the signature page. But why could they not add more instances to the pool? Possibly the data or cache layer was overwhelmed; I'm sure the application layer can scale just fine. And why didn't they design it right in the first place? This level of interest isn't normally seen so they probably never did any load testing scenarios of this type. They do have their own development team but I'm not sure what sort of budget they have.