To mitigate this latency issue, the buttons are rendered in 2 steps, as follows:

reducing the latency is not so easy. It is defined by the physical properties of the transfer medium, the speed of light and the distance to the server. All of these three are hard to optimize.

Our approach strikes a balance between privacy, computation overhead, and network latency. While single-party private information retrieval (PIR) and 1-out-of-N oblivious transfer solve some of our requirements, the communication overhead involved for a database of over 4 billion records is presently intractable. Alternatively, k-party PIR and hardware enclaves present efficient alternatives, but they require user trust in schemes that are not widely deployed yet in practice. For k-party PIR, there is a risk of collusion; for enclaves, there is a risk of hardware vulnerabilities and side-channels.

How to troubleshoot NFS transfer latency issues using “nfsiostat”