Fastest L2 block time, live across Robinhood, Arbitrum, Base and 7 more
BlockchainsArbitrum
Leads334 ms
- p99
- 500 ms
- rank
- #2
- samples
- 342,674
Optimism
Trails1.91 s
- p99
- 2.98 s
- rank
- #4
- samples
- 43,174
Arbitrum vs Optimism
Arbitrum leads on 7 of 7 shared benchmarks, Optimism on 0. Arbitrum wins on Fastest L2 block time, live across Robinhood, Arbitrum, Base and 7 more (334 ms vs 1.91 s), Fastest free public RPC for Ethereum, BNB, Polygon and 23 more chains (plus Solana and Polkadot) (248 ms vs 330 ms), Fastest Wormhole VAA finalization by source chain, live latency (17.1 min vs 17.5 min), Fastest Chainlink CCIP source chain by end-to-end delivery latency (21.1 min vs 22.5 min).
Arbitrum
Optimistic rollup built on Nitro stack with a fast-finality sequencer. Sub-second block times (~250 ms) via a 250 ms default block interval, far below the 2 s OP Stack convention. 7-day fraud-proof window for L1 finality.
Optimism
Optimistic rollup and the canonical OP Stack reference implementation. 2-second sequencer block time, 7-day fraud-proof window, anchored to Ethereum L1 via batch submissions to the Optimism Portal.
Side by side measurements
Fastest free public RPC for Ethereum, BNB, Polygon and 23 more chains (plus Solana and Polkadot)
RPCsArbitrum
Leads248 ms
- p99
- 462 ms
- rank
- #6
- samples
- 4,322
Optimism
Trails330 ms
- p99
- 401 ms
- rank
- #11
- samples
- 4,321
Most reliable free public RPC, correctness incidents across 7 EVM chains
RPCsArbitrum
No data in window
Optimism
No data in window
Fastest Wormhole VAA finalization by source chain, live latency
BridgesArbitrum
Leads17.1 min
- p99
- 29.1 min
- rank
- #11
- samples
- 9
Optimism
Trails17.5 min
- p99
- 19.9 min
- rank
- #13
- samples
- 1
Fastest Chainlink CCIP source chain by end-to-end delivery latency
BridgesArbitrum
Leads21.1 min
- p99
- 29.8 min
- rank
- #9
- samples
- 16
Optimism
Trails22.5 min
- p99
- 29.9 min
- rank
- #10
- samples
- 3
Fastest LayerZero source chain by end-to-end message delivery
BridgesArbitrum
Leads31.23 s
- p99
- 29.2 min
- rank
- #4
- samples
- 1,459
Optimism
Trails1.0 min
- p99
- 34.0 min
- rank
- #12
- samples
- 479
Fastest Hyperlane source chain by end-to-end message delivery
BridgesArbitrum
Leads10.26 s
- p99
- 28.00 s
- rank
- #2
- samples
- 586
Optimism
Trails23.26 s
- p99
- 56.76 s
- rank
- #9
- samples
- 173
Fastest Axelar GMP source chain by end-to-end delivery
BridgesArbitrum
Leads20.7 min
- p99
- 29.8 min
- rank
- #6
- samples
- 41
Optimism
Trails26.1 min
- p99
- 39.5 min
- rank
- #8
- samples
- 27
Frequently asked questions
Arbitrum vs Optimism: which one is better?
Arbitrum and Optimism are compared on 8 shared OpenChainBench benchmarks. Arbitrum leads on Fastest L2 block time, live across Robinhood, Arbitrum, Base and 7 more. See the live table on this page for every metric.
Which is faster on fastest l2 block time, live across robinhood, arbitrum, base and 7 more, Arbitrum or Optimism?
On the Fastest L2 block time, live across Robinhood, Arbitrum, Base and 7 more benchmark, Arbitrum leads at 334 ms versus Optimism at 1.91 s. Live measurement is updated continuously by the OpenChainBench harness.
How is the Arbitrum vs Optimism comparison measured?
Every benchmark on this page uses the same open methodology, published at https://openchainbench.com/methodology. Data is CC-BY-4.0. Measurement harnesses are MIT-licensed.
How this pair was selected
A pair is published when all four conditions hold. Both providers run in the same OpenChainBench benchmark for at least seven consecutive days. Each provider has at least 1000 samples in the measurement window. The head to head query has observable third party search demand. Both providers have a public /products/[slug] page on OCB. The full pair ledger is versioned in the public repo so the methodology is externally verifiable.