Vitalik Buterin Says Ethereum Must Prioritize Bandwidth Over Speed

TLDR

• Vitalik Buterin said Ethereum must focus on scaling bandwidth instead of reducing latency.
• He explained that physical limits and decentralization make ultra-fast block times unsafe.
• He stated that Ethereum is designed for global coordination and not for high-speed processing.
• Buterin emphasized that Layer 2 networks will handle fast and localized applications.
• He mentioned that Ethereum can scale thousands of times using PeerDAS and zero-knowledge proofs.

Ethereum co-founder Vitalik Buterin stated that the network should scale through bandwidth, not chase faster block speeds, as limitations remain. He argued that decentralization and physics restrict latency reduction, and instead emphasized bandwidth as a safer and more scalable route. He further outlined Ethereum’s long-term role as a global coordination infrastructure, not a high-speed transaction system.

Ethereum Should Scale With Bandwidth, Not Latency

Vitalik Buterin explained that Ethereum must prioritize increasing bandwidth over reducing latency due to physical and decentralization limits. In his latest post, he argued that lowering block times hits barriers beyond engineering, including the speed of light. He warned that supporting rural and home-based nodes makes ultra-fast finality technically unsafe.

He wrote, “With PeerDAS and ZKPs, we know how to scale,” stating Ethereum can expand thousands of times using these tools. Buterin highlighted how the base layer must remain decentralized, which limits validator speeds and global synchronization. He said increasing bandwidth ensures scalability without compromising security or decentralization.

Buterin acknowledged minor latency gains of 3-6x are possible with peer-to-peer improvements and validator count reduction. However, he stressed those improvements cap around 2-4 second block times due to physics and network diversity. Beyond this, Ethereum faces unsolvable issues tied to distance, hardware, and global connectivity.

Ethereum Mainnet Serves as the World’s Trust Layer

Vitalik Buterin positioned Ethereum as “the world heartbeat,” focused on secure consensus for higher-layer speed-focused applications. He dismissed the idea of Ethereum acting like a global video game server or AI-grade processor. He stated the base layer must serve “planetary coordination,” not microsecond applications.

“Ethereum belongs to Terra,” Buterin wrote, noting Layer 2 solutions will handle city-level or even building-level needs. He emphasized AI systems will need local solutions, as machine-speed communication can’t stretch beyond city distances. As a result, Ethereum rollups will manage both regional and global capacity needs.

Buterin compared Ethereum’s structure to Linux and BitTorrent, saying it can remain decentralized while serving mass users. He noted, “Linux is quietly depended on by billions,” drawing parallels to Ethereum’s growth. This comparison aligned Ethereum’s role as neutral infrastructure supporting enterprise and open-source users alike.

Hardware and Physics Limit Blockchain Consensus Speed

Buterin outlined specific limitations for block verification, including CPU usage, memory, and network overhead for decentralized nodes. He said block validation must not exceed 5-10% CPU usage to avoid denial-of-service risks and ensure battery longevity. He added offline sync and background processes further reduce usable computing capacity.

Bandwidth remains constrained, as network reliability and multi-app usage lower the effective throughput for each node. He said home users rarely reach advertised speeds, and peer-to-peer overhead cuts bandwidth even further. He stressed this limits how much data Ethereum can safely propagate.

He explained storage should not exceed 512 gigabytes for consumer hardware, or verification costs grow disproportionately. He warned a 4x state size increase can result in 6x higher processing time. These effects persist even with enhancements like statelessness and state expiry, making them hard limits.

Recent data shows 292,000 new addresses are created daily since December’s Fusaka upgrade, reflecting rising Ethereum activity. Buterin confirmed these gains are possible through scalable design, not faster blocks. He stated Ethereum’s architecture must support long-term decentralization, not compromise for short-term speed.

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