OpenChainBench
Full benchmark: Fastest L2 block time, live across Robinhood, Arbitrum, Base and 7 more
BlockchainsOptimism

Optimism block time

As of July 31, 2026, Optimism block time is 1.97 s at the median (p50, 24h window), with 2.80 s at p90 and 2.99 s at p99. Optimism ranks #5 of 10 chains measured on this benchmark.

Optimism block time is 1.97 s (p50, 24h). The OP Stack ships with a hard-coded 2 second sequencer interval, which is what the Optimism Foundation sequencer commits to; the L2 only produces a new block when that timer fires, even on empty traffic. Settlement is on Ethereum via blob calldata after Dencun. Measured by holding a persistent `newHeads` WebSocket against the public Optimism sequencer RPC and reporting the inter-arrival delta.

How Optimism compares

Live p50 over the last 24 hours across every chain on this benchmark, ranked lowest first.

  1. #1Robinhood Chain78 ms
  2. #2Arbitrum One327 ms
  3. #3Mantle1.78 s
  4. #4Base1.93 s
  5. #5Optimism1.97 s
  6. #6Taiko1.98 s
  7. #7Blast1.98 s
  8. #8zkSync Era2.80 s
  9. #9Scroll4.81 s
  10. #10Linea5.74 s

Methodology, charts and the full ledger live on the Fastest L2 block time, live across Robinhood, Arbitrum, Base and 7 more page. Raw data: JSON endpoint.