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Solana raised block compute limit to 100 million CUs, but hot-account bottlenecks remain

Solana raised block compute limit to 100 million CUs, but hot-account bottlenecks remain

SIMD-0286 lifts aggregate block capacity by 66.7% and expands room for unrelated transactions, while per-account limits and fee dynamics remain unchanged.

SOL

Fact Check
The specific '10% to 23% of blocks exceed old limit' statistic traces directly to Pine Analytics' original July 31, 2026 post, which states 10–23% of blocks now go over the old 60M-CU cap in any given hour. SolanaCompass independently reports the same figure citing Pine Analytics. The 66.7% increase in per-block compute capacity (60M to 100M CUs via SIMD-0286) is confirmed by CryptoSlate and SolanaCompass, as is the framing that the upgrade eases general block-space pressure while hot-account congestion (the unchanged 12M-CU per-account write cap) remains an unresolved constraint on throughput. All elements of the claim are well-corroborated by primary and secondary sources.
Summary

Solana lifted its maximum compute per block to 100 million compute units from 60 million on July 29 through SIMD-0286, a 66.7% increase. The change gives block leaders more room to include unrelated transactions, but it does not alter the separate 12 million-CU cap on how much any single account can consume within a block, nor the 100MB maximum accounts-data size delta. That means congestion around hot accounts, where many transactions compete to write the same state, remains a constraint for high-volume DEX activity and liquidation contracts. The official note does not provide before-and-after measurements for transaction confirmation, fees, block propagation or replay.

Terms & Concepts
  • CU: Compute units, a measure of transaction-processing work on Solana.
  • hot accounts: Shared writable state that many transactions try to update, creating contention.
  • DEX: A decentralized exchange where transactions can cluster around the same on-chain accounts.