Just after the NU7 upgrade reduced $ZEC block times from 75 to 25 seconds, developers ValarDragon and Evan Forbes proposed a further reduction to 20 seconds in a draft ZIP for a potential NU7.1 upgrade.

This modification aims to enhance payment confirmations, exchange deposits, and cross-chain swaps while maintaining the current private transaction capacity and the established issuance schedule with a 21 million supply cap.