[shackledtodesk]

ELB scales horrible and can not scale to even tens of thousands of connections per second, let alone handling spikes of 100k/sec simultaneous connections. Even if you get AWS to prewarm to ELB at a higher peak rate, if you spike over those limits you will drop new incoming connections. HTTPS termination is trivial compared to a requirement to be able to actually handle hundreds of thousands to millions of simultaneous connections per second.

[kolev]

Actually, ELB can scale pretty well... but... you need to file a form and they will up your ELB capacity. Totally ridiculous; the situation with CloudFront.