Solana raised its maximum block compute from 60 million to 100 million compute units at the start of epoch 1009, a 66% increase that went live on July 29, 2026. The upgrade landed only after more than 70% of mainnet stake ran XDP kernel bypass networking. It should thin out failed transactions during surges, but it does not promise cheaper fees.
Solana lifted its per-block compute ceiling from 60 million to 100 million CUs at the start of epoch 1009 on July 29, 2026, a 66% bump that arrived after months of prep work and network checks. The chain had been bumping into the old 60M-CU ceiling in peak periods, when the global cap still bites even though local fee markets isolate hotspots.
Why the 60M-CU ceiling had to move
Solana's own data shows 11.2% of blocks used 56M CUs or more between the 60M-CU activation in July 2025 and the 100M uplift — roughly one out of nine blocks scraping the ceiling. Hugging the cap makes latency uneven and spikes fees in pockets, because some wallets get more aggressive with prioritization fees while other transactions stay stuck.
A higher ceiling does not remove contention entirely. It absorbs more of the short bursts that used to cause visible pain.
XDP adoption cleared the way
The change is tracked as SIMD-0286, widely covered as authored by Lucas Bruder of Jito Labs. Propagation was the main prerequisite: the foundation's upgrade notes flag XDP, a kernel bypass networking stack, as table stakes so nodes could sling heavier blocks across the network fast enough.
That bar had to clear before the feature gate opened. More than 70% of mainnet stake had XDP enabled when the switch was flipped.
Cheaper fees are not guaranteed
Whether fees drop depends on demand, how localized congestion is, and how quickly validators can propagate heavier blocks. More compute per block should reduce how often transactions fail or get re-sent after losing the fee auction by a hair, yet demand can still outrun supply.
Validators carry the cost of the extra room, since heavier blocks mean more to verify, more to store and more to ship to peers. MEV searchers gain a wider set of viable bundles, but propagation still rules everything, tilting the advantage further toward nodes with the fastest networking stack. Operators at the edge, or on shared hosts, may find missed slots creep up if they do not keep pace with the stack others are running.
Sources: Solana Foundation, Crypto Daily
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