Solana has activated a big network upgrade that accelerates the blockchain’s maximum block size from 60 million to 100 million compute units (CUs), marking a 66% jump in block capacity. The change went live on the mainnet on July 29, at the start of epoch 1009, succeeding deployments on testnet and devnet. The change introduced through SIMD-0286, and authored by Jito Labs led validators to add significantly more computational work in each block without altering Solana’s existing 400-millisecond block time.
Rather than changing how decentralized applications are built, the improvement gives the network extra headroom to process more transactions during intense activity periods. The move shows Solana’s broader strategy of scaling infrastructure ahead of surging demand, particularly as decentralized finance (DeFi), payments, and on-chain trading continue to push network utilization more.
Why Has Solana Increased Its Block Capacity?
Compute units calculate the amount of computational work required to facilitate transactions on Solana. By increasing the maximum block limit from 60 million to 100 million CUs, validators can use a larger number of transactions within every block while maintaining the network’s current block production speed. Necessarily, the upgrade changes only the maximum block compute unit limit. Other network parameters, including a 12 million CU limit for writable accounts and the 100 MB block account data size delta, remain unfazed.
The decision follows nearly a year of real-time usage data. Since the prior increase to 60 million CUs in July 2025, approximately 11.2% of all blocks reached at least 56 million CUs, signaling that network demand frequently approached the existing ceiling during periods of heightened activity and market volatility. Instead of adopting a new process to increment to 80 million CUs, Solana developers opted directly for 100 million CUs after performance improvements across validator software depicted sufficient execution.
How the Upgrade Affects Solana’s Throughput
The increase is expected to better Solana’s ability to facilitate transaction surges without forcing users to compete aggressively for limited block space. During periods of heavy network activity such as token launches, NFT mints, or volatile crypto markets, more transactions can now be facilitated in each block, reducing congestion and improving overall network efficiency. Because the writable account limit remains fixed at 12 million CUs, the extra capacity benefits parallel workloads rather than one high-end application to dominate an entire block.
100M CU blocks are live on mainnet.
SIMD-0286 raises the block limit from 60M → 100M compute units. 66% more capacity. https://t.co/4RWPIfx1Bw
— Solana (@solana) July 29, 2026
Under the prior limit, one busy account could use up to 20% of a block’s capacity. Following the change, that share dropped to around 12%, leaving more space for unrelated applications and transactions to execute parallelly. For users, this leads to smoother transaction processing during peak periods, with a lower chance of delays caused by congestion. Developers also benefit as prevailing decentralized applications do not need modifications to take benefit of the increased capacity.
The change was made feasible by improvements to Solana’s validator infrastructure, particularly wider adoption of XDP (Express Data Path), a kernel-bypass networking technology available in Agave 4.0 and enabled by default in FireDancer. More than 70% of the mainnet stake has already deployed XDP, giving core developers the benefit that larger blocks can be fixed safely across the network, while validators, RPC providers, exchange, and indexing services are expected to cross-check their infrastructure and handle sustained 100 million CU blocks. The change introduces no breaking changes or indexing modifications.
As blockchain networks compete to support the demand and consumer applications, Solana’s newest capacity expansion reinforces its focus on scaling throughput through developments. By creating extra room for simultaneous transaction processing while preserving fast block times, the network aims to support future growth in payments, seamless finance, and high-frequency trading without affecting the users.
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