flowchart TD
    subgraph EngineTask[Engine]
        Block
            -->|Execute transactions sequentially| Execute[Execute transaction]
            --> CollectStateUpdates[Collect all accounts and storage slots that were modified]
    end

    subgraph TransactionThread[Prewarming thread]
        Prewarm[Execute transaction on top of previous block]
            --> CollectPrefetchTargets[Collect all accounts and storage slots that were modified]
    end

    subgraph StateRootTask[State Root Task thread]
        StateRootMessage::PrefetchProofs
        StateRootMessage::StateUpdate
        StateRootMessage::FinishedStateUpdates
        StateRootMessage::RootCalculated
    end

    newPayloadRequest[engine_newPayload request] --> Block
    Block -->|Start prewarming each transaction in a separate thread| Prewarm
    CollectPrefetchTargets --> StateRootMessage::PrefetchProofs
    CollectStateUpdates --> StateRootMessage::StateUpdate
    Execute -->|All transactions finished executing| StateRootMessage::FinishedStateUpdates
    StateRootMessage::RootCalculated
        --> newPayloadResponse[engine_newPayload response]