BNB Chain’s Pasteur Upgrade: A Paradigm Shift in Network Scalability and Throughput

By Tony Kim
September 14, 2026

The blockchain industry is in a perpetual race toward higher throughput and lower costs, and BNB Chain (BSC) has just taken a monumental leap forward. Following the successful activation of the "Pasteur" hard fork on August 25, 2026, the network has officially entered a new era of block efficiency. By fundamentally re-engineering how blocks are assembled and validated, the Pasteur upgrade—anchored by the implementation of BEP-675—has unlocked a 28% increase in gas capacity, providing the vital headroom needed for the network’s ambitious scaling roadmap toward a 90 million gas limit.

The Core Innovation: BEP-675 and the End of Redundancy

To understand the magnitude of the Pasteur upgrade, one must first look at the legacy architecture of the BNB Smart Chain. Prior to the hard fork, the network’s block production process was inherently burdened by repetitive execution. Every time a block was assembled, the Ethereum Virtual Machine (EVM) was required to run three distinct execution passes to verify and finalize transactions. While this provided a high degree of security, it created a bottleneck that effectively capped the network’s efficiency.

BEP-675 introduces a streamlined architecture that effectively eliminates these redundant execution cycles. Under the new protocol, builders are empowered to submit "BidBlocks"—fully executed blocks that arrive at the validator stage ready for finalization. By shifting the heavy lifting of execution to the builder level and submitting the results as a "BidBlock V2," the network removes the need for the redundant EVM passes that previously occupied valuable block space.

This is not merely a marginal improvement; it is a fundamental architectural shift. By reducing the computational overhead required to produce a single block, the network effectively "reclaims" execution window time. This reclaimed time is then repurposed to process additional transactions, directly contributing to the 28% increase in gas capacity observed in the days following the upgrade.

A Chronology of the Pasteur Transition

The rollout of the Pasteur upgrade was a meticulously orchestrated event, reflecting the maturity of the BNB Chain ecosystem.

• August 25, 2026: The Pasteur hard fork is officially activated on the mainnet. The transition is seamless, with the network successfully pivoting to support the BidBlock V2 format.
• August 26–August 31, 2026: The ecosystem undergoes a rapid adoption phase. Builders and validators synchronize their infrastructure to accommodate the new block production standards.
• September 1, 2026: A critical observation milestone is reached. Data analysis confirms that BidBlock V2 has captured approximately 98% of all block production, with the legacy "Bid V1" format relegated to a minor fallback role.
• September 14, 2026: The network officially crosses the 55 million gas limit threshold. With utilization consistently tracking above 95%, the transition to the next phase of the scaling roadmap becomes a matter of imminent operational necessity.

The swiftness of this adoption—achieved in less than a week—highlights the deep coordination between the BNB Chain core developers and the network’s primary builders, such as 48Club and BlockRazor. These entities, which account for the vast majority of block production, acted as the vanguard for this technological leap, ensuring that the transition did not result in network instability or downtime.

Supporting Data: Efficiency Metrics and Throughput Gains

The performance data post-Pasteur provides an empirical foundation for the success of the upgrade. Before the implementation of BEP-675, blocks were typically constrained to a 33.8 million gas limit. Following the transition to the BidBlock V2 format, that capacity surged, with peak performance hitting 43.8 million gas.

This represents a significant leap in the "utility density" of every block. Moreover, testnet benchmarks conducted prior to the mainnet launch suggest that the implications for throughput are staggering. While current operational throughput is being managed with stability in mind, the theoretical throughput improvements—moving from 1,237 Transactions Per Second (TPS) to 2,324 TPS—represent an 88% increase in capacity.

For the end-user, this translates into lower transaction latency and a reduced likelihood of network congestion during periods of high market volatility or intense NFT/DeFi activity. Even with the current gas limit set at 55 million, the network is maintaining high utilization rates, proving that the demand for block space on BNB Chain remains robust even as capacity expands.

Scaling Toward the 90M Horizon

The Pasteur upgrade is not an end state but a launchpad. The BNB Chain roadmap clearly outlines a phased approach to gas limit increases, with the ultimate target of 90 million gas per block. This is a deliberate, data-driven process. The network is currently operating at a 55 million gas limit, with plans to increment this ceiling to 70M, 80M, and finally 90M in the coming months.

Each increase is contingent upon the stability of the network. As the gas limit rises, the underlying infrastructure—including synchronization protocols and node memory efficiency—must be capable of handling larger data payloads without compromising finality. This "stair-step" approach allows developers to monitor for potential issues in real-time, ensuring that the pursuit of throughput does not sacrifice the network’s decentralization or security.

This scaling philosophy distinguishes the Pasteur upgrade from previous efforts like the Fermi or Osaka/Mendel hard forks. While earlier upgrades were largely focused on shaving milliseconds off block times and improving network stability, Pasteur is explicitly designed for volume. It is a high-capacity architecture designed to support a future where BNB Chain serves as the primary settlement layer for high-frequency decentralized finance and enterprise-grade applications.

Market Implications and Institutional Outlook

As of September 14, 2026, BNB is trading at $724.58. While the market reaction to the upgrade has been relatively muted in the short term, the underlying value proposition of the BNB token is intrinsically linked to the network’s utility.

Institutional adoption is rarely driven by single hard fork announcements; rather, it is driven by the consistent, long-term reliability and capacity of a network. By increasing the gas limit and streamlining execution, BNB Chain is effectively lowering the cost of "doing business" on the chain. Lower congestion and higher throughput make the ecosystem more hospitable for institutional-grade dApps, such as cross-border payment rails, decentralized exchanges with high-frequency trading capabilities, and large-scale tokenization projects.

Furthermore, as the network approaches the 90M gas limit, the increased supply of block space may help to stabilize gas prices during periods of extreme network demand. This predictability is a key requirement for developers and institutions looking to build sustainable long-term projects on a blockchain.

Conclusion: A Resilient Path Forward

The Pasteur hard fork is a testament to the ongoing evolution of the BNB Chain. By tackling the architectural debt of redundant EVM execution, the development team has created a more efficient and scalable foundation for the future.

The successful transition to BEP-675 and the rapid adoption by the network’s builders underscore the community’s alignment toward a common goal: scalability without compromise. As the network looks toward the 90 million gas limit, the challenges will shift from simple execution efficiency to broader infrastructure performance. However, given the network’s performance over the last month, there is strong evidence that the BNB Chain is more than capable of navigating the path ahead.

In an ecosystem where speed and capacity are the primary metrics of success, the Pasteur upgrade has positioned BNB Chain as a formidable competitor, ready to handle the next wave of global blockchain adoption. Whether the network can successfully reach and maintain a 90M gas limit will be the defining challenge of the next fiscal year, but the progress made thus far suggests that the foundation is stronger than ever.