Hi,
Indeed, the current notarization delay is 1000ms on the Internet Identity subnet and all other System subnets. I forgot to change and update our proposal template summary description to 1000ms when submitting the proposal. So yes, the 600ms in the summary is an error/typo.
Yes, we have done extensive benchmarks with testnets with 40 and 31 nodes that indicate it is safe to lower the notarization delay down to 300ms. In the benchmarks we also simulate RTT, packet loss, and bandwidth to mimic the production topology based on our metrics. The benchmarks are the same ones we did with the Application testnets. The benchmarks involve:
- Stress testing the subnet with a high load of Ingress messages, filling every execution round.
- Kill nodes on the subnet for an extended duration, then restart the node to verify that it can state sync, catch up, and participate in block-making