- Ethereum’s Glamsterdam upgrade cleared a key rehearsal before a proposed Oct. 6 deployment on Sepolia.
- Nethermind completed all 2,302 performance tests while measuring block-level access list processing.
- A 200 million gas limit was tested on the devnet, but it is not yet planned for Ethereum’s main network.
Ethereum Glamsterdam moved through another important test stage as developers continued confirming blocks under new block-building rules ahead of a proposed October 6 rollout on the Sepolia public test network. The upgrade is designed to support a major increase in network capacity, and its latest rehearsal included a higher block gas limit and testing of block-level access lists. Those changes are intended to help Ethereum process more activity within each block while reducing pressure that can lead to fee spikes. At the same time, developers are still treating the larger gas limit as a test setting rather than a final decision for the main network.
Ethereum Glamsterdam clears a key rehearsal
Ethereum continued confirming blocks after adopting the new block-building rules earlier in the week, marking a key checkpoint before the proposed Sepolia deployment. The test showed that the upgrade could keep operating under the revised setup, which is an important step before application teams begin trying their software on the public test network.
The planned October 6 deployment on Sepolia still needs formal confirmation. Even so, the current rehearsal gives developers more evidence that Glamsterdam is progressing toward the next testing phase, where broader ecosystem participants can evaluate how their applications behave before the upgrade reaches Ethereum users.
Performance tests under the new rules
Nethermind, one of the software clients used by computers that run Ethereum, carried out a performance benchmark tied to one of the main Glamsterdam changes. Its execution software completed all 2,302 tests while processing 570.7 billion gas in three minutes and 15 seconds, which averaged about 2.9 billion gas per second.
The benchmark measured Nethermind’s execution software rather than the speed of the full network. It focused on block-level access lists, which indicate in advance which accounts and stored data a block will use. That early notice allows computers to fetch data and check unrelated transactions at the same time instead of handling as much work in sequence.
What Ethereum Glamsterdam is testing
About an hour after going live on the testnet, Glamsterdam raised the block gas limit from 60 million to 200 million. Gas measures the computing work required by transactions, so that higher ceiling creates more room in each block for payments, token swaps, and other network activity.
A 200 million limit could allow Ethereum to absorb more activity before users start outbidding one another for block space. That could make fee spikes less severe when trading surges or when a popular token launch clogs the network. Still, the setting remains part of a controlled test and is not currently planned for Ethereum’s main network.
Capacity trade-offs and network timing
Larger blocks can be harder to verify, which could make it more difficult for smaller operators to keep up. Glamsterdam is meant to add capacity without making the chain too expensive to run, so the testing is not only about raising limits but also about checking whether the system can handle the added demands.
The upgrade also changes how block building and validation interact. Specialized builders package transactions, while validators check the finished blocks and secure the chain. Glamsterdam would bring that handoff and the related payments inside Ethereum’s own rules, reducing reliance on outside relay services. It also extends the time to spread block data across the network from about two seconds to nine seconds, giving validators longer to receive and verify the larger blocks.
Conclusion
Ethereum Glamsterdam has now cleared a notable rehearsal as developers prepare for a proposed October 6 deployment on the Sepolia public test network. The latest results included continued block confirmation under new rules, a full pass across 2,302 Nethermind performance tests, and a test increase in the block gas limit from 60 million to 200 million. The work is aimed at helping Ethereum support more activity while easing fee pressure during busy periods. Even so, the larger gas limit is still only a test setting, and the current devnet exercise was a controlled rehearsal without deliberate attacks.
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