Reading from s3 stuck

I'm starting to test OpenVDS with AWS. After create container, I try to read it back. On my first vm_1 running test take 100% CPU and almost not using network, process is stuck. With vm_2 it work better, but not all time.

vm_1: t3.large (2 CPU, 8 GB RAM) vm_2: t3.x2large (8 CPU, 32 GB RAM)

I have questions:

1. Did you have any recommendations to minimal vm configuration ?
2. Can I disable 'aws_sdk_' logs without library change ?
3. Do you have restrictions to data size for OpenVDS::VolumeDataAccessManager::RequestVolumeSubset ?

read_OVDS.cc