Practical Byzantine Fault Tolerance is often a consensus algorithm launched within the late 90s by Barbara Liskov and Miguel Castro. pBFT was designed to work efficiently in asynchronous(no upper bound on when the response to your request will be received) methods. It is actually optimized for minimal overhead time. https://financefeeds.com/canada-regulator-launches-ringtone-campaign-to-help-seniors-spot-investment-fraud/