TL;DR Ethereum Layer 2 Transition: Celo shifts from a standalone L1 blockchain to an Ethereum L2 network using optimistic rollups, leveraging Ethereum’s robust security and ecosystem. Boosted Performance: The upgrade reduces block times from 5 seconds to 1 second, enhancing scalability, interoperability, and low-cost transaction speed. Strengthened Ecosystem: With key partnerships (Aave, Uniswap, etc. ) and
source: https://crypto-economy.com/celo-upgrades-to-layer-2-enhancing-security-and-transaction-speed/