Anza recommends that Solana mainnet validators upgrade to Agave 4.0, which reduces Turbine retransmission latency to approximately 0.8ms.

According to Mars Finance, on May 18th, Anza, the developer of Solana, announced that it has officially recommended that mainnet validators upgrade to Agave 4.0. This upgrade introduces XDP for Turbine, QUIC-only TPU data access, a faster replay stage, and several SIMD features that will be activated in this cycle. Anza stated that production environment testing on large mainnet validators shows that XDP has reduced Turbine retransmission latency from approximately 600ms to approximately 0.8ms, providing crucial performance headroom for Solana to advance towards 100 million CU blocks. Furthermore, Agave 4.0 has completely removed UDP transaction access, making QUIC the only transaction submission method; PoH entry verification and Ed25519 signature verification have also been moved out of the critical path and processed asynchronously to improve replay stage performance. This upgrade will also gradually enable several SIMD features, including p-token (an alternative to SPL Token that can release approximately 13% of block capacity), Stake Program v5, SBPFv3 support, pre-funded account creation, and BLS12-381 syscall.