Solana just boosted block capacity by a massive 66%, but the one bottleneck infuriating traders hasn’t budged

Solana raised the maximum computation allowed per block from 60 million to 100 million compute units on July 29, a 66.7% jump that gives unrelated transactions more room without changing the separate cap governing its busiest accounts.

Compute units, or CUs, measure computational work performed by transactions. The block limit caps the aggregate CUs a leader can include before the block is full.

The on-chain feature account identifies SIMD-0286 as active at slot 435,888,000, at the start of epoch 1009, while the activation block timestamps that slot to July 29. The change raised the block limit by 66.7% mathematically, which the Solana Foundation presents as 66%.

The Solana Foundation said 11.2% of blocks produced between the July 22, 2025 activation of the 60 million-CU limit and the latest increase used at least 56 million CUs.

Why a hot account can still hit its cap

SIMD-0286 changed only the overall block limit. The maximum compute that can write to any single account within a block remains 12 million CUs, while the maximum block accounts-data size delta remains 100MB. In this context, a hot account is shared writable state that many transactions try to update, not necessarily one trader's wallet.

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