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Glamsterdam is moving through Ethereum's final testing phase, with a mainnet launch expected in the second half of 2026, most likely around September–October. The upgrade introduces enshrined Proposer-Builder Separation, or ePBS, and aims for 3X network speed. That performance target makes smart-contract compatibility a central test before activation.
Why it matters
ePBS would change how Ethereum organizes block production, while faster processing is meant to give applications more room to scale. The upside is a more capable base layer. The risk is that smart contracts and supporting infrastructure must continue to behave reliably under the new network conditions.
This makes Glamsterdam more than a routine software release. It tests whether Ethereum can raise performance without weakening the application layer that gives the network its economic value.
Market impact
For ETH, the near-term signal is the upgrade path, not a mainnet change already in force. Final testing and compatibility results will determine whether the 3X speed target strengthens Ethereum's scaling case, while any disruption to smart-contract applications would undercut it. Investors will be watching the late-2026 launch window and evidence of smooth adaptation before activation.
Frequently asked questions
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When is Glamsterdam expected to reach Ethereum mainnet?
Glamsterdam is expected on mainnet in the second half of 2026, most likely around September–October.
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What major design change does Glamsterdam introduce?
The upgrade introduces enshrined Proposer-Builder Separation, or ePBS, which changes how Ethereum organizes block production.
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Why does the 3X speed target raise smart-contract concerns?
Faster network conditions raise the compatibility bar for existing smart contracts and supporting infrastructure. The upgrade tests whether Ethereum can improve performance without weakening its application layer.
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What is the near-term market signal for ETH?
The near-term signal is Ethereum's upgrade path, not a mainnet change already in force. Final testing and compatibility results will determine whether the 3X target strengthens Ethereum's scaling case.
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What should investors watch before the launch?
Investors should watch final testing, compatibility results, the September–October 2026 launch window, and evidence that smart-contract applications adapt without disruption.
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