You are right - the amount of throughput you get is based on how much data you store. Whats unintuitive about EFS is you get an "allotment" of throughput. Lets

You are right - the amount of throughput you get is based on how much data you store. Whats unintuitive about EFS is you get an "allotment" of throughput. Lets say you have 100MiB of data, you would get 100 MiB of throughput (example numbers). So you read that 100MiB of data, really quickly, and then the next time you read it, EFS is as slow as molasses. So lets say you are using EFS for application deploys. Your application might only be 50MiB, but if you are doing multiple deploys a day, you might find that your deploy time shoots through the rough after 20 deploys. You find out that you have used up your "EFS" credits and the only way to get more is to store more data on EFS. I believe the first tier is at 100GiB.