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Performance · easy

11. Compute Budget and Units (CUs)

Managing transaction compute and priority.

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Every transaction has a default compute budget (typically 200,000 CUs, capped at 1,400,000 CUs). Programs consume CUs per instruction. Transactions can request additional CUs or pay priority fees using the ComputeBudgetProgram.

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Check your understanding

1. What happens when a Solana transaction exhausts its compute budget?
The transaction immediately halts and all state changes revertIt pauses until next blockIt charges extra SOL automaticallyIt drops priority
2. How can developers reduce compute unit consumption in programs?
Avoid unnecessary logging (msg!), reduce repetitive serialization, and optimize account spaceIncrease SOL balanceUse float mathRemove discriminators

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