Solana vs Arbitrum: which is the best blockchain?

In the rapidly evolving blockchain landscape, the comparison between Solana and Arbitrum represents a fascinating study of different approaches to solving blockchain's fundamental challenges. As two prominent platforms with distinct technical architectures—Solana as a Layer 1 solution and Arbitrum as a Layer 2 scaling solution for Ethereum—they offer contrasting visions for blockchain's future. This comprehensive analysis examines Solana vs Arbitrum across critical performance metrics to determine which blockchain might be better suited for various use cases.

Introduction to the blockchains

Solana: The high-performance Layer 1

Solana emerged in 2020 as a high-performance Layer 1 blockchain designed from the ground up to address the blockchain trilemma of security, decentralisation, and scalability. Built with a novel Proof of History consensus mechanism working alongside Proof of Stake, Solana aims to deliver exceptional throughput. The blockchain has positioned itself as a direct competitor to Ethereum in attracting dApp development, focusing on high transaction speeds and low costs.

Arbitrum: Ethereum's Layer 2 scaling solution

Arbitrum, developed by Offchain Labs, represents a different approach as a Layer 2 scaling solution built atop Ethereum. Launched on mainnet in 2021, Arbitrum utilises optimistic rollup technology to process transactions off the Ethereum mainnet while inheriting its security properties. By batching multiple transactions together before submitting them to Ethereum, Arbitrum aims to reduce congestion on the main chain while maintaining compatibility with Ethereum's ecosystem.

Speed and transaction throughput

When comparing Solana vs Arbitrum on speed metrics, the differences are substantial. Solana consistently processes 2,000 to over 4,000 transactions per second in real-world conditions, with a theoretical maximum of 65,000 TPS. This remarkable throughput stems from Solana's unique architecture and Proof-of-History consensus mechanism, which timestamps transactions to establish chronological order without requiring nodes to communicate extensively.

Arbitrum, as an Ethereum Layer 2 solution, significantly improves upon Ethereum's base layer speed of approximately 15-30 TPS. Arbitrum can process a few hundred to potentially a few thousand transactions per second in bursts within its Layer 2 environment, depending on network activity and optimization. However, these transactions are ultimately batched and settled on Ethereum, creating a dependency on Ethereum's finality times for ultimate Layer 1-settled confirmation.

For applications requiring near-instantaneous finality, Solana's sub-second Layer 1 confirmation times offer a distinct advantage over Arbitrum's optimistic rollup model, which requires waiting periods, known as the challenge period, for full Layer 1-settled finality.

Scalability solutions

Solana's approach to scalability is built into its core Layer 1 architecture. Rather than implementing additional layers for its base functionality, Solana achieves scalability through innovations such as :

• Proof of History for transaction ordering efficiency,
• Gulf Stream mempool management for transaction forwarding,
• Sealevel for parallel transaction processing,
• Turbine for block propagation,
• and Pipelining for transaction processing optimisation.

Arbitrum takes a fundamentally different approach to scalability as a Layer 2 solution. It utilizes :

• optimistic rollups that process transactions off-chain,
• data compression techniques to reduce the on-chain footprint on Ethereum,
• fraud proofs to ensure transaction validity,
• and a delayed finality model that allows for high throughput while leaning on Ethereum's security guarantees.

In the Solana vs Arbitrum scalability comparison, Solana offers high, immediate Layer 1 scalability benefits, while Arbitrum provides scalability for Ethereum dApps by processing transactions off-chain and leveraging Ethereum's security model.

Transaction fees

Transaction costs represent one of the most noticeable differences in the Solana vs Arbitrum comparison. Solana maintains consistently low transaction fees, typically averaging around $0.00025 USD per transaction regardless of network congestion levels. This predictability makes Solana particularly attractive for high-frequency trading applications and micro-transactions.

Arbitrum significantly reduces Ethereum's base layer fees, with transactions typically costing between $0.10 to $1.00 USD, and sometimes lower or higher, depending on complexity, network conditions on Arbitrum, and importantly, the cost of posting data to Ethereum L1. While this represents a substantial improvement over Ethereum mainnet fees, Arbitrum remains more expensive than Solana for standard transactions.

For applications where transaction costs significantly impact viability—such as gaming, micropayments, or high-frequency trading—Solana's fee structure offers clear advantages in the Solana vs Arbitrum comparison.

Decentralisation and security

Decentralisation represents a complex dimension in the Solana vs Arbitrum comparison. Solana operates with approximately 2,000 to over 3,000 active validators. Concerns sometimes arise regarding its hardware requirements and historic token distribution concentration, though efforts to broaden participation are ongoing. The high-performance requirements for running a Solana validator potentially limit broader participation compared to less demanding networks.

Arbitrum, by inheriting Ethereum's security model for its Layer 1 settlement, benefits from Ethereum's well over 1,000,000 active validators. However, as a Layer 2 solution, Arbitrum introduces additional considerations. Its optimistic rollup mechanism includes a challenge period during which transactions could theoretically be disputed, and the network's sequencer, responsible for ordering and batching transactions, is currently operated by Offchain Labs, representing a point of centralization, although plans for decentralizing the sequencer are in development.

Security considerations for both networks include that Solana has experienced several network outages in its earlier years, raising reliability concerns, though significant improvements are ongoing. Arbitrum's security for final settlement ultimately depends on Ethereum's underlying security. Solana's validator hardware requirements may create different decentralization pressures compared to running an Ethereum validator. Arbitrum's fraud-proof system requires active verifiers monitoring during its challenge periods to ensure network integrity.

Ecosystem development

The ecosystem comparison between Solana vs Arbitrum reveals distinct strengths. Solana has developed a robust ecosystem particularly strong in :

• decentralised exchanges like Raydium and Orca,
• NFT marketplaces including Magic Eden and Tensor,
• DeFi protocols such as Marinade Finance and Solend,
• and numerous gaming and metaverse applications.

Arbitrum has attracted significant Ethereum-native projects and new deployments due to its EVM compatibility and lower fees compared to Ethereum L1. This includes :

• decentralised exchanges like GMX and SushiSwap,
• lending protocols such as Aave,
• derivatives platforms including Dopex,
• and various cross-chain bridges and infrastructure projects.

Total Value Locked metrics show both Arbitrum, as a leading Layer 2, and Solana having multi-billion dollar TVLs as of early 2025. These figures fluctuate significantly with market conditions, and their relative ranking can change over time.

Use cases and applications

The Solana vs Arbitrum comparison reveals different optimal use cases based on their respective strengths.

Solana excels in :

• high-frequency trading applications,
• micropayment systems,
• gaming platforms requiring low latency,
• NFT marketplaces with high transaction volumes,
• and consumer applications requiring consistently low fees.

Arbitrum demonstrates advantages in :

• DeFi applications requiring Ethereum compatibility and leveraging existing Ethereum liquidity and network effects,
• complex smart contract deployments benefiting from mature EVM tooling,
• applications prioritising leveraging Ethereum's security over achieving the absolute maximum Layer 2 speed,
• and projects migrating from Ethereum seeking lower costs and higher throughput while remaining within the Ethereum ecosystem.

Network reliability and performance

Network reliability represents a significant consideration in the Solana vs Arbitrum comparison. Solana experienced several notable network outages in its earlier years, including a 17-hour downtime in September 2021 and additional incidents in 2022. These outages raised concerns about the network's stability under extreme load conditions, though significant network upgrades like localized fee markets, the QUIC protocol, and the development of new validator clients like Firedancer are actively enhancing resilience.

Arbitrum has demonstrated greater uptime reliability regarding its own Layer 2 operations. However, as a Layer 2 solution, its full functionality remains dependent on Ethereum's base layer stability. Arbitrum has experienced fewer complete outages affecting its own chain but has faced temporary sequencer issues or periods of high Layer 2 fees when Ethereum Layer 1 was heavily congested.

Conclusion: Selecting the optimal blockchain

The Solana vs Arbitrum comparison reveals that neither blockchain represents a universally superior choice—each offers distinct advantages for specific use cases.

Solana delivers exceptional Layer 1 performance for applications prioritising high throughput, low latency, and minimal transaction costs. Its architecture makes it particularly well-suited for consumer applications, gaming, and high-frequency trading platforms.

Arbitrum provides a compelling solution for developers seeking Ethereum compatibility with improved scalability and reduced costs on a Layer 2. Its security model, leveraging Ethereum's established infrastructure, appeals to applications where leveraging Ethereum's security and ecosystem is a priority, even if it doesn't match Solana's raw Layer 1 speed.

The optimal choice between Solana vs Arbitrum ultimately depends on specific project requirements, considering factors such as required transaction speed, cost sensitivity, security priorities, EVM compatibility needs, and desired ecosystem integration. As both platforms and the broader blockchain landscape continue to evolve, their respective strengths and limitations will likely shift, requiring ongoing evaluation from developers and users alike.