Ethereum’s Glamsterdam upgrade has nearly tripled Sepolia’s block-gas limit, increasing it from about 60 million to almost 200 million. The change gives developers a live environment to evaluate how Ethereum handles a much larger block-processing budget. Initial results have been stable, but tested blocks have consumed less than half of the available capacity, and the experiment does not guarantee that mainnet will adopt a similar limit.
More than 25 consecutive Sepolia blocks consumed between roughly 52 million and 92 million gas, equivalent to about 26% to 46% of the new allowance. During another six-minute testing period, all 32 expected blocks were produced, and 99.97% of eligible testnet stake voted for finality. Hoodi is currently expected to undergo the upgrade on October 27, assuming the Sepolia testing delivers satisfactory results.
Glamsterdam Tests Sepolia’s Capacity
The Glamsterdam upgrade was activated on Sepolia on October 6. By October 8, blocks were being produced under a gas limit of close to 200 million, compared with approximately 60 million before the upgrade, according to CoinDesk.
Gas measures the computational resources required to execute transactions. When transaction demand exceeds the available block space, users compete to have their transactions processed, which can result in higher fees. Increasing the gas limit creates room for more activity before that competition becomes significant.
Still, a threefold increase in gas capacity should not be interpreted as a threefold increase in transaction throughput. Glamsterdam modifies the gas costs of certain operations, so the number of transactions that can fit into a block will depend on the type of activity and the revised cost structure.
Reviews of more than 25 consecutive blocks showed usage ranging from approximately 52 million to 92 million gas. None came close to the roughly 200 million ceiling. That means the test has not yet subjected the network to sustained full blocks, which would place greater demands on the machines operating Ethereum.
Glamsterdam also modifies how transaction-processing responsibilities are distributed between transaction builders and validators. The changes are intended to give validators more time to verify the computations contained in blocks.
Another component introduces lists of accounts and storage locations accessed by transactions. This can allow software to retrieve data in advance and process transactions that do not depend on one another in parallel. The changes form part of Ethereum’s broader efforts to increase capacity while supporting its Layer-2 scaling ecosystem.
Strong Block Production During Additional Testing
The upgrade also performed well during a separate six-minute voting period. All 32 scheduled blocks were proposed, while 99.97% of eligible testnet stake voted toward finality, according to the ethPandaOps explorer.
These results indicate that the upgraded network successfully maintained scheduled block production and attracted nearly all eligible stake during the observed period. However, they do not demonstrate that blocks consistently approaching 200 million gas would remain reliable under significantly heavier demand or under all mainnet conditions.
Sepolia serves as a public Ethereum test network where developers can evaluate protocol changes using tokens without real economic value. Its performance therefore provides useful operational data, but it should not be treated as a direct prediction of Ethereum mainnet’s future transaction capacity.
Hoodi Testing Next
Hoodi is tentatively scheduled to follow Sepolia, with October 27 currently targeted for the upgrade if the Sepolia results are satisfactory. Ethereum mainnet does not yet have a confirmed activation date, and developers have not finalized a production gas limit.
The Sepolia results will help determine how Glamsterdam progresses through subsequent testing. However, a higher gas limit on a testnet only demonstrates that Ethereum can experiment with additional capacity; it does not mean the same configuration is ready for mainnet.
Developers will still need to assess validator workloads, block production, data processing, and the revised costs associated with computation and storage before setting a final production limit.
Glamsterdam is part of Ethereum’s wider protocol roadmap, which evaluates capacity improvements alongside network economics, functionality, and scaling requirements. For now, the Sepolia test shows that Ethereum can operate with a substantially larger gas ceiling, while actual block usage remains well below that limit. It should not yet be viewed as evidence of a threefold increase in Ethereum mainnet throughput.
