Ethereum’s next major upgrade is starting to look less like a roadmap promise and more like an engineering stress test. The Glamsterdam upgrade has cleared another rehearsal, bringing developers one step closer to testing how the network handles significantly more activity.
The latest test focused on one of the upgrade’s most important changes: new rules for building blocks and handling the computing work inside them. Ethereum’s Devnet-11 test network has already adopted those rules and continued confirming blocks successfully.
Then came a performance test from Nethermind, one of the software clients used by computers running Ethereum.
The client completed all 2,302 tests in three minutes and 15 seconds while processing 570.7 billion gas. That works out to roughly 2.9 billion gas per second.
The number is impressive, but there is an important catch. The benchmark measured Nethermind’s execution software, not the performance of Ethereum’s entire network.
What developers were really testing was block-level access lists. These lists give Ethereum computers advance notice about which accounts and stored data a block will need to access.
That matters because it can change how the work gets done. Instead of processing much of the activity in sequence, computers can prepare data and handle unrelated transactions at the same time.
For a blockchain that has to balance more users with increasingly heavy computation, that parallelism could make a meaningful difference.
What the Ethereum Glamsterdam upgrade is trying to unlock
On Devnet-11, Ethereum raised the block gas limit from 60 million to 200 million about an hour after the testnet went live.
Gas represents the amount of computing work required to process transactions. Raising the ceiling means a single block can accommodate more activity, from ordinary payments to token swaps and the kind of trading bursts that can suddenly consume available block space.
In practice, more room could mean less intense competition when demand spikes. Instead of users immediately outbidding one another for limited block space, the network would have a larger capacity buffer to absorb activity.
But bigger blocks come with a very Ethereum-specific problem: they are harder for computers across the network to process and verify.
That creates a tension at the heart of the Glamsterdam upgrade. The network wants more capacity, but it also wants to remain practical for smaller operators to run.
The proposed changes also address how blocks are assembled and distributed. Specialized builders package transactions, while validators verify those blocks and help secure Ethereum.
Glamsterdam would bring that handoff, along with the payments involved, directly into Ethereum’s protocol rules. The aim is to reduce the network’s reliance on external relay services.
There is another adjustment hiding in the details. The upgrade would increase the time available to distribute block data across the network from roughly two seconds to nine seconds.
That extra time becomes more important as blocks get larger. Validators would have longer to receive the data, process it and check that everything is valid.
For now, though, the 200 million gas limit is strictly a test configuration. It is not a commitment to set Ethereum’s main network at that level.
And Devnet-11 was deliberately controlled. The rehearsal was not designed to simulate deliberate attacks or every extreme condition the live network might encounter.
The next milestone is already on the calendar. Developers are targeting October 6 for the Glamsterdam upgrade to reach Sepolia, Ethereum’s public test network, where application teams can see how their software behaves under the proposed changes.
That date has not yet received formal confirmation, so the upgrade is still in rehearsal mode.
Still, the direction is clear: Ethereum is testing whether it can fit more activity into each block without making the network harder to operate. Glamsterdam’s challenge is not simply making Ethereum bigger. It is making bigger capacity compatible with the machinery that keeps the chain running.