Solana’s Agave 4.2 goes live: 90% rent cut, 3.3x larger transactions and the road to 200ms slots

Three feature gated upgrades began activating on Solana mainnet the week of August 17. A 90% reduction in on chain storage rent, a 3.3 fold increase in maximum transaction size, and a staged slot time reduction from 400ms toward 200ms represent Solana’s most significant infrastructure change since Firedancer reached mainnet. Summary Solana’s Agave 4.2 client began mainnet feature activation the week of August 17, delivering three independent upgrades: a 90% rent reduction, 3.3 times larger transactions, and a staged slot time cut from 400ms toward 200ms. SIMD-0437 cuts the lamports per byte constant from 6,960 to 696, reducing the rent exempt deposit for a standard SPL token account from roughly $0.16 to approximately $0.016, lowering the cost of deploying on chain programs and creating token accounts by an order of magnitude. SIMD-0296 raises maximum transaction size from 1,232 bytes to 4,096 bytes through a new v1 transaction format, enabling ZK proofs, large multisigs and on chain BLS signature schemes to land as single atomic transactions. SIMD-0525 targets 200ms slot times in four successive 50ms decrements, with a safeguard that halts progression if block skip rates exceed a ...