I ship wal logs to s3 for backup, and I do test restores on EC2. What I've found is that most of the files can be grabbed really quickly, in the 3mb/sec range,

I ship wal logs to s3 for backup, and I do test restores on EC2. What I've found is that most of the files can be grabbed really quickly, in the 3mb/sec range, but there's always a handful that run at 300k/sec. Running the downloads 8 or more at a time tends to help with that so that we're mostly maxing out the local network.