Ethereum Fusaka Testnet Results: Everything You Need to Know Before Mainnet Launch

What is the Ethereum Fusaka Upgrade and why it matters

The upgrade known as Fusaka for the Ethereum network bundles multiple infrastructure-level improvements. It is a pivotal step in the ethereum fusaka testnet mainnet launch. According to analysis, Fusaka includes around 11 to 12 major Ethereum Improvement Proposals (EIPs) designed to boost throughput, reduce node cost and improve data availability.
One key change is raising the block gas limit to about 60 million units, from prior levels (~45 million) in testnets.
Another major element is the Peer Data Availability Sampling system (PeerDAS), which allows validators to sample small pieces of transaction blobs instead of downloading entire datasets. This reduces node bandwidth and storage burdens.
When the upgrade becomes active, the network will be better equipped to support Layer 2 rollups, higher transaction volume, and more complex smart-contract activity—all without changing application-level logic or breaking existing decentralized apps. That means DApp developers and users won’t face interface disruptions.

A look at the ethereum sepolia holesky testnet update

Holesky testnet phase

Earlier in the testing cycles, the Holesky testnet for Ethereum completed its role and entered sunset phase. The ethereum sepolia holesky testnet update article notes that Holesky will be shut down after the Fusaka fork is finalised.
The Holesky network had been a workhorse for testing staking infrastructure and validator operations, and its gradual deprecation signals readiness to move toward mainnet activation.

Sepolia testnet phase

Subsequently the Sepolia testnet became the active testbed for Fusaka. The deployment on Sepolia focused on higher gas limits and PeerDAS, marking a major milestone before mainnet rollout.
The success on Sepolia gives confidence that the ethereum fusaka testnet mainnet launch is on track. For example, the testnet measured block finality around 680 ms at the 60 M gas limit, and validators saw significantly reduced data‐load via PeerDAS—reports estimate up to 70-80 % reduction.

When is the ethereum fusaka upgrade mainnet activation?

The question of when is ethereum fusaka upgrade is central for developers, infrastructure teams and Web3-projects. Initially slated for early November 2025, the mainnet activation date has shifted toward December. According to CoinDesk, it is expected at the beginning of December 2025, subject to the final rehearsal on the Hoodi testnet.
More precisely, a report states that the Hoodi testnet launch is set for October 28, 2025, with mainnet rollout expected on December 3, 2025.
Thus for projects planning around the ethereum fusaka testnet mainnet launch, this timeline gives a clear window for final preparations and node upgrade readiness.

Key results from testnet performance

Throughput and gas limit outcomes

On testnets such as Sepolia, Fusaka’s higher gas limit (~60 M) allowed more transactions per block and indicated throughput improvements. One analysis reported that Layer 1 performance could reach 40-60 transactions per second (TPS) under the new gas limit, up from about 15-20 TPS previously.
This increase is meaningful for rollups, which rely on the base layer for data posting and settlement.

Node cost efficiency and decentralisation

One of the most significant testnet findings involves PeerDAS. By enabling validators to sample data instead of downloading full blobs, validator hardware and bandwidth costs may drop substantially—some estimates suggest up to 70 % reduction in data-load.
Lower node cost means more operators—especially smaller validators—can participate, which supports decentralisation.

Stability and reliability

Test results also demonstrated strong performance under load. For example, 60 M gas blocks were proposed and accepted within 680 ms at the 90th percentile on Sepolia, showing that larger blocks do not necessarily degrade latency.
These outcomes help validate readiness for mainnet rollout.

Implications for developers, rollups and users

For Layer 2 rollups

With the higher gas limit and improved data availability, rollups such as zkSync, Optimism and Arbitrum stand to benefit from lower transaction fees and improved batching capacity. The ethereum fusaka testnet mainnet launch therefore matters especially to rollup ecosystems.

For node operators

Smaller validators or new entrants may find the environment more accessible post-Fusaka. Reduced node requirements plus improved performance may encourage wider participation and decentralisation of infrastructure. Transition words: “Moreover”, “Furthermore”, “In addition”, help the flow.

For developers and DApps

Because Fusaka is non-disruptive to smart-contract interfaces, developers won’t need to rewrite applications. DApps built on Ethereum can expect smoother performance especially during high traffic sessions. Transition words: “However”, “On the other hand”, “Nevertheless”.

What to watch ahead and next steps

As the network approaches the ethereum fusaka testnet mainnet launch, here are key items:

• Ensure your validator or node client is updated to support the Fusaka EIPs and PeerDAS implementation.
• Projects building on rollups should monitor when the mainnet activation date is formally announced and test on testnets accordingly.
• Monitor on-chain metrics post-launch: average block gas usage, TPS, validator participation, and rollup fee flows.
• Keep an eye on the next major upgrade after Fusaka, the so-called Glamsterdam upgrade, expected in 2026, which may bring block-time reduction and other performance enhancements.

The journey to the ethereum fusaka testnet mainnet launch marks a major milestone in Ethereum’s evolution. With testnet results proving the upgrade’s performance and cost benefits, stakeholders can prepare for a smoother transition. Developers, validators, rollups and users all stand to gain from the improvements. As the date nears—most likely early December 2025—preparation will be key. With proper readiness, the upgrade can unlock enhanced throughput, lower costs and stronger decentralisation across the Ethereum ecosystem.

Read Also: How PeerDAS & Fusaka Make Ethereum Layer 2 Faster

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