Mounted bucket throughput drops

[Michaelvll]

I am testing transferring a tar file from a bucket to ebs. When using the aws s3 cp, the throughput keeps around 200MB/s. When I mount the bucket with our sky storage, the first few cp also have about 200MB/s throughput. However, after a while, when I try to run cp again, the throughput drops to 35MB/s (the aws s3 cp throughput still keeps around 200MB/s).