Ethereum’s Glamsterdam upgrade has pushed Sepolia’s block-gas limit from around 60 million to nearly 200 million, giving developers a real-world test of how the network performs with significantly more capacity. Early performance has been positive, but recent blocks have used well below the new ceiling. The test also does not mean Ethereum mainnet will necessarily adopt a 200 million gas limit.
More than 25 consecutive blocks consumed between about 52 million and 92 million gas, representing roughly 26% to 46% of the available capacity. In a separate six-minute test window, all 32 scheduled blocks were produced, while 99.97% of eligible testnet stake supported finality. Hoodi is tentatively scheduled for October 27, depending on the results from Sepolia.
Sepolia Provides a Live Test of Higher Capacity
Glamsterdam was activated on Sepolia on October 6. By October 8, the testnet was producing blocks with a limit close to 200 million gas, up from approximately 60 million before the upgrade, according to CoinDesk.
Gas measures the computational work required to process transactions. When demand for block space exceeds supply, users compete for transaction inclusion, potentially pushing fees higher. A larger block-gas allowance could therefore let Ethereum process more activity before congestion increases.
However, increasing the gas limit by roughly three times does not automatically mean transaction throughput will also triple. Glamsterdam changes the gas costs for certain operations, meaning the number of transactions that fit into each block will vary according to the type and complexity of activity being processed.
Analysis of more than 25 consecutive blocks found gas consumption between approximately 52 million and 92 million. At 26% to 46% of the available limit, the blocks remained far from the new ceiling. The network therefore has not yet been tested with sustained blocks near maximum capacity, which would create a more demanding environment for the computers operating Ethereum.
The upgrade also changes how transaction-processing tasks are handled between those responsible for assembling transactions and validators responsible for publishing blocks. The changes give validators additional time to verify transaction calculations.
Glamsterdam also introduces lists of accounts and storage data touched by transactions. Software can use that information to retrieve data in advance and process independent transactions in parallel. These changes are designed to support Ethereum’s broader scaling plans, including its Layer-2 ecosystem.
Sepolia Maintains Strong Block Production
A separate six-minute voting period provided another positive signal. All 32 scheduled blocks were successfully proposed, while 99.97% of eligible testnet stake voted toward finality, according to the ethPandaOps explorer.
The results show that the upgraded configuration maintained block production and attracted almost all eligible stake during the observed period. However, they do not prove that Ethereum could safely sustain blocks close to 200 million gas under prolonged heavy demand or across every condition that could occur on mainnet.
Sepolia is a public testnet where developers can trial Ethereum upgrades using tokens that have no real economic value. Its performance offers useful information about the upgrade, but it should not be treated as a direct measure of how much additional transaction activity Ethereum mainnet will ultimately support.
Hoodi Next as Mainnet Decision Remains Open
Hoodi is expected to be the next public testnet for Glamsterdam, with October 27 tentatively targeted if Sepolia testing meets expectations. Ethereum mainnet does not yet have a confirmed activation date, and the final production gas limit remains undecided.
The Sepolia results will help developers determine the next steps, but the distinction is important: testing a higher gas limit demonstrates that the network can experiment with greater capacity, not that the same configuration is ready for mainnet.
Before deployment, developers will need to consider validator workloads, block production, computational requirements, and data-storage costs alongside the higher gas allowance.
Glamsterdam is one part of Ethereum’s broader protocol roadmap, where capacity improvements are evaluated alongside network economics, functionality, and scaling needs. For now, Sepolia has demonstrated that the network can operate with a much higher gas ceiling, but block usage remains well below that threshold. The test therefore does not yet indicate a confirmed threefold increase in Ethereum mainnet throughput.
