release: add a few performance-related notes
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@ -33,6 +33,28 @@ frequently tested on them.
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Notable changes
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===============
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Performance Improvements
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--------------
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Validation speed and network propagation performance have been greatly
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improved, leading to much shorter sync and initial block download times.
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- The script signature cache has been reimplemented as a "cuckoo cache",
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allowing for more signatures to be cached and faster lookups.
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- Assumed-valid blocks have been introduced which allows script validation to
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be skipped for ancestors of known-good blocks, without changing the security
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model. See below for more details.
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- In some cases, compact blocks are now relayed before being fully validated as
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per BIP152.
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- P2P networking has been refactored with a focus on concurrency and
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throughput. Network operations are no longer bottlenecked by validation. As a
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result, block fetching is several times faster than previous releases in many
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cases.
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- The UTXO cache now claims unused mempool memory. This speeds up initial block
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download as UTXO lookups are a major bottleneck there, and there is no use for
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the mempool at that stage.
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Manual Pruning
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--------------
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