Ethereum Gets a Big Upgrade to Become Faster and Cheaper
Ethereum, one of the world’s most popular cryptocurrencies, is getting a major update today called the Fusaka hard fork. Think of this as a big software update for the entire Ethereum network, designed to help it handle more information and run more smoothly.
This is the second major update for Ethereum in 2025. Let’s break down what’s happening in simple terms.
What is a Hard Fork?
A hard fork is a rule change for a blockchain. When it happens, everyone using the network must upgrade to the new rules. It’s like when a video game gets a mandatory update; old versions are no longer compatible. These updates add new features and improvements.
Big Improvements for Speed and Data
The main goal of the Fusaka upgrade is to improve two key things: data availability and scalability.
- Data Availability: This is about making it easier for the network to access and verify transaction data. Learn more about data availability.
- Scalability: This means helping the network handle a much larger number of transactions without slowing down, just like adding more lanes to a highway to reduce traffic jams.
The Star of the Show: PeerDAS
The biggest new feature is called Peer Data Availability Sampling (PeerDAS). It sounds complicated, but the idea is simple.
Imagine the people who check and approve transactions (called validators) have to read a huge book full of data for every transaction block. Before, they had to read the entire book to make sure it was correct. With PeerDAS, they only need to check a few random pages from the book. By checking small samples, they can be confident the whole book is correct without needing to download it all.
This simple change means:
- Less work for validators: It reduces the amount of data they need to download by up to 85%.
- Much faster network: It can increase the network’s data speed by up to 8 times!
Tomorrow: Fusaka
Ethereum’s second major upgrade this year.
→ Feature highlight: PeerDAS – Unlocking up to 8x data throughput. For rollups, this means cheaper blob fees and more space to grow.
Learn more. https://t.co/3TOda5KjY2 pic.twitter.com/sEfeiTamy9
— Ethereum (@ethereum) December 2, 2025
What This Means for Layer 2 Networks
These improvements are especially great news for Layer 2 (L2) networks. L2s are solutions like Arbitrum, Optimism, and Base that are built on top of Ethereum to make transactions faster and cheaper. Think of Ethereum as the main highway and L2s as express toll roads that help avoid traffic.
With Fusaka, these L2 networks can send their data to the main Ethereum highway much more cheaply. As a result, users of these networks are expected to see transaction fees drop by 40-60%.
More Room for Everyone
The upgrade also increases Ethereum’s block gas limit. A “block” is like a bus that carries transactions. “Gas” is the fee you pay to get your transaction on the bus. By increasing the gas limit, Ethereum is making the bus much bigger (from 30 million to 150 million units), so it can carry more transactions at once.
To prevent any single person from taking up the entire bus, a new rule (EIP-7825) sets a cap so that no single transaction can use all the space. This prevents network jams and protects against attacks.
The Big Picture: A More Modular Ethereum
This upgrade is part of Ethereum’s long-term plan to become “modular.” This means breaking Ethereum into different layers that can be upgraded separately, like building with LEGOs. This helps improve the network’s speed and security without sacrificing decentralization, which is the core idea that no single person or group controls the network.
What’s Next?
Layer 2 networks like Arbitrum and Optimism are expected to start using these new features in the coming weeks, which is when users should start to feel the benefits of lower fees.
The next major upgrade, named Osaka, is planned for 2026. It will bring even more improvements to make Ethereum cheaper, faster, and more accessible for everyone.
Originally published on CryptoPotato.