The Return of Layer 1 Scaling
For the past several years, Ethereum’s scaling narrative has been dominated by Layer 2 solutions. Rollups, bridges, and off-chain execution environments have carried the heavy lifting of transaction throughput, allowing the network to handle thousands of operations per second without congesting the main chain. But as the ecosystem matures, developers and researchers are quietly shifting their attention back to the foundation. Ethereum’s upcoming Glamsterdam upgrade is currently entering final devnet testing, and it signals a deliberate return to optimizing the base layer itself.
What Exactly Is the Glamsterdam Upgrade?
Like previous Ethereum upgrades, Glamsterdam is not a single feature drop but a coordinated set of protocol improvements designed to enhance efficiency, security, and developer experience. Right now, the proposal is undergoing rigorous final devnet testing. This is a critical phase where core developers simulate real-world conditions, stress-test the new mechanics, and patch any vulnerabilities before the code is deployed to public testnets. Once those testnets stabilize, the upgrade will be scheduled for mainnet activation.
Key Innovations: ePBS, Access Lists, and Gas Optimization
The Glamsterdam upgrade introduces three major technical shifts that collectively aim to make Ethereum’s base layer faster and more predictable:
- Enhanced Proposer-Builder Separation (ePBS): The original PBS mechanism was introduced to decentralize block production and reduce censorship risks. ePBS refines this architecture by improving the communication layer between block proposers and transaction builders. The result is lower latency, better block space allocation, and a more resilient marketplace for transaction ordering.
- Block-Level Access Lists: Validators currently pay a premium when reading state data that hasn’t been pre-announced. Access lists allow block builders to specify exactly which contract addresses and storage slots will be accessed in a block. This pre-warming of state data significantly reduces computational overhead, leading to faster block processing and lower execution costs.
- Gas Market Adjustments: The upgrade introduces subtle but impactful changes to how gas fees are calculated and prioritized. By smoothing out fee volatility and improving the base fee algorithm, the protocol aims to make transaction costs more predictable for both everyday users and high-frequency DeFi applications.
Why the Focus Is Shifting Back to the Base Layer
It might seem counterintuitive to invest heavily in Layer 1 scaling when Layer 2 networks are already handling the bulk of user activity. However, Ethereum’s long-term architecture relies on a healthy symbiosis between the two layers. Layer 2s ultimately settle on the base chain, and they rely on Ethereum for data availability, security, and finality. If the base layer becomes a bottleneck, every Layer 2 solution inherits that congestion.
The Layer 2 Era and the Need for Foundation Work
Over the last few years, the community successfully offloaded computation to secondary networks. But as those networks grow in complexity, the base chain is being asked to store more calldata, verify more proofs, and coordinate more cross-chain messages. Glamsterdam addresses this by making the base layer leaner. By reducing redundant computation and streamlining data access, Ethereum can support a higher volume of Layer 2 settlements without bloating its own state.
Real-World Impact on Validators and Developers
For validators, the upgrade means more efficient hardware utilization and reduced operational friction. Block-level access lists, in particular, will help lower the barrier to entry for new node operators who previously struggled with high memory demands. For developers, the refined gas mechanics and improved PBS architecture translate to more reliable transaction ordering and fewer failed operations during peak network activity. These are not flashy consumer features, but they are the kind of infrastructure upgrades that make the entire ecosystem more stable.
What Happens Next?
With final devnet testing underway, the Ethereum core developer team is now focused on stress testing and community feedback. Public testnets will soon go live, giving independent researchers, dApp teams, and infrastructure providers the chance to run the new code in a live environment. This phase is crucial for catching edge cases that only emerge under real network conditions. Assuming the testnets perform as expected, the Glamsterdam upgrade will move into its formal proposal and activation timeline, following Ethereum’s established governance process.
Final Thoughts
Ethereum’s development strategy has always been iterative, and the Glamsterdam upgrade is a perfect example of that philosophy in action. Rather than chasing short-term hype, the team is methodically strengthening the protocol’s core mechanics. By refining proposer-builder separation, introducing block-level access lists, and optimizing gas dynamics, Ethereum is quietly rebuilding its foundation for the next phase of adoption. Layer 2s will continue to play a vital role, but a stronger, more efficient base layer ensures that the entire ecosystem can scale sustainably. For anyone tracking the evolution of blockchain infrastructure, this upgrade is a reminder that real progress often happens behind the scenes, one carefully tested protocol change at a time.
