Investigate slow performance when in TLS mode.

We’ve found that when using TLS mode, some (all?) workflows are an order of magnitude slower than when not using TLS mode. It seems the slowness is related to crypographic processing (performed by the bouncycastle library). The purpose of this task is to work closely with FSE and PTF teams to investigate the slowness, identify bottlenecks, test potential optimizations and propose next steps.

Findings should be captured on the wiki and discussed with the team and/or architects.

Additional Notes:

• There are GitHub issues in the BC community complaining about slowness. One suggestion is to use HSM (Hardware Security Model), which comes with increased cost. It will need to be discussed with FSE. We should not stop here, but look at other options as well.