[threeseed]

Have you actually used EFS/S3 before ?

Because both are ridiculously slow to the point where they would be completely unusable for a service such as Twitter whose current latency is based off everything largely being in memory.

And Twitter already evaluated using the cloud for their core services and it was cost-prohibitive compared to on-premise.

[mschuster91]

EFS indeed sometimes has latency issues I've never been able to track down, but S3 with Cloudfront? That is more than enough as a CDN.