Solana Block Capacity Up 66% Following SIMD-0286 Activation

Following the successful activation of SIMD-0286, Solana’s block limit has risen from 60M CUs (compute units) to 100M CUs, marking a 66% increase in the amount of data that can be packed into one block.

In practice, the upgrade means Solana is capable of scaling its best-in-class trading and payments infrastructure, raising the ceiling on economic activity across the network.

Solana’s performance, speed, and transaction finality are only expected to improve in H2, with further network upgrades like Alpenglow and Agave 4.2 scheduled to go live later this year. 

100M CU Blocks Are Live on Solana Mainnet

Initially authored by Jito Labs co-founder Lucas Bruder, SIMD-0286 has been implemented on the Solana mainnet, raising the network’s block limit from 50M CUs to 100M CUs, a 66% increase. Effectively, this means that each block can contain more data, resulting in boosting the number and complexity of transactions in each block.

CUs, or compute units, are a unit of measurement tracking how resource-intensive each transaction is. By raising the limit from 60M CUs to 100M CUs, slot leaders effectively have more available space in each block for packing transactions. With higher caps, each block can now fit more activity into each slot, resulting in a more efficient and more performant network.

Solana’s latest CU limit increase comes as a direct result of consistently strong demand for blockspace. Solana Foundation data indicates around 11.2% of blocks produced since July 22, 2025, included over 56M CUs, stretching the maximum capacity of the previous 60M CU limit. 

With onchain activity rising amidst a new wave of trading activity, led by institutional players and a flourishing RWA market, it is imperative that Solana’s block capacity increases in line with surging demand.

The upgrade is already making its presence felt. According to ultrasoundsol, several slots are already pushing past the previous 60M CU limit, with some blocks getting packed with over 75M-80M CUs.

Alpenglow, Agave 4.2 to Push Scalability Further in H2

Beyond this week’s block limit increases, upcoming network improvements are expected to accelerate Solana’s performance even further in Q3. Anza’s next validator client update, Agave v4.2, is currently targeting implementation on August 17, bringing with it 200ms slot times and rent reduction.

While Solana Labs co-founder Anatoly Yakovenko previously suggested that Alpenglow would ship to mainnet at the same time as Agave v4.2, Anza has yet to give a definitive timeline for its implementation.

Promising to reduce Solana’s transaction finality to as low as 150ms, and reduce validator operating costs, Alpenglow is expected to go live sometime in Q3, based on Solana Foundation communications. While the precise timeline is still uncertain, the network has already begun preparing validators for the transition.

Outside headline upgrades like Alpenglow and Agave v4.2, $SOL holders also have a wealth of upcoming governance proposals that are slated to improve tokenomics. According to Anza CEO Brennan Watt, SIMD-0550 and SIMD-0553 are both expected to be voted on before the end of the year. 

If approved, these updates will collectively double $SOL’s disinflationary rate and introduce a resource-based $SOL burn mechanism designed to drive value to the network’s native token.

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