Solana cut its mainnet target slot time from 400 milliseconds to 350 milliseconds in its first staged speed change. The new timing took effect when epoch 1020 began on Aug. 21 after a one-epoch delay under SIMD-0525. Trillium measured a 365.4ms slot-weighted mean in post-change epoch 1021, compared with 420.7ms in pre-change epoch 1015. The next 300ms stage remained pending as of Aug. 26.