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Ethereum‘s next major upgrade, Glamsterdam, has passed a critical rehearsal, successfully producing blocks under new block-building rules. Nethermind completed performance testing of Block-level Access Lists, passing all 2,302 tests, while the testnet raised its block gas limit from 60 million to 200 million. Glamsterdam aims to expand capacity without significantly increasing node operating costs by improving block processing architecture. Developers are targeting an October 6 deployment on the Sepolia testnet, with the final schedule to be confirmed through official meetings. The 200 million gas limit is not yet a confirmed figure for mainnet implementation.
Key Elements
Ethereum’s next major upgrade, Glamsterdam, has passed a critical rehearsal, successfully producing blocks after applying new block-building rules. Developers are targeting an October 6 deployment on the Sepolia public testnet, with the final schedule to be confirmed through official meetings.
The test was designed to verify whether Glamsterdam’s capacity expansion goals function in a real-world environment. Approximately one hour after the testnet went live, the block gas limit was raised from 60 million to 200 million — a more than threefold increase. Gas is a unit representing the computational work required to process transactions; a higher limit allows more transfers, token swaps, and smart contract executions to fit within a single block.
Nethermind, an Ethereum client software developer, also completed performance testing of “Block-level Access Lists,” one of Glamsterdam’s core features. The client passed all 2,302 tests, processing 570.7 billion gas in 3 minutes and 15 seconds. Average throughput was approximately 2.9 billion gas per second.
This benchmark measures the performance of Nethermind’s execution software, not overall network speed. Block-level Access Lists are a mechanism that pre-announces which accounts and storage data a block will use, allowing Ethereum computers to identify required information before beginning block processing. This enables data retrieval and unrelated transaction verification to proceed concurrently.
Currently, Ethereum processes much of this work sequentially, which has acted as a limiting factor on how much activity can safely fit into a single block. Glamsterdam aims to expand capacity by improving block processing architecture without excessively driving up node operating costs.
As blocks grow larger, the computational ree. If small-scale node operators cannot process large blocks in a timely manner, network decentralization could weaken. Glamsterdam is designed to mitigate these concerns
Specifically, in the current structure where specialized builders bundle transactions and validators verify the resulting blocks, Glamsterdam incorporates the handoff process and associated payments into Ethereum’s own protocol rules. This effectively reduces reliance on external relay services. Additionally, the time allotted for distributing block data across the network increases from roughly 2 seconds to 9 seconds, giving validators more breathing room to receive and verify larger blocks.
The 200 million gas limit is not yet a confirmed figure for mainnet implementation — it is closer to a test configuration. Devnet-11, the development network used in this exercise, was also designed as a controlled-environment rehearsal without intentional attacks.
Once Glamsterdam reaches mainnet, Ethereum will be able to absorb congestion events — such as transaction surges or popular token launches that trigger competitive fee bidding for block space — for longer periods. This means the intensity of fee spikes could be softened. However, the actual effect will depend on where the mainnet gas limit is ultimately set.
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Source: finance.biggo.com