Solana Tests Quantum Safety, Speed Drops 90% in Trials

• Post-quantum tests on Solana show 90% speed drop due to signatures up to 40 times larger than current cryptography.
• Public key exposure increases vulnerability, making Solana more at risk in a future quantum attack scenario.
• Developers test interim fixes like Winternitz Vaults, but full network upgrades remain complex and challenging.

A new test by Solana and Project Eleven on post-quantum security exposed a sharp performance hit on April 2026 test runs. The collaboration aimed to prepare for quantum threats but revealed signatures up to 40 times larger. As a result, network speed dropped 90%, raising concerns about scalability and execution under real conditions.

To understand the risks, Project Eleven deployed a test environment replacing Solana’s current cryptography. This setup used quantum-resistant signatures to simulate future attack conditions. However, the results showed immediate strain on performance.

According to Project Eleven CEO Alex Pruden, these signatures are significantly larger than existing ones. As a result, the network processed far fewer transactions at once. In testing, throughput declined sharply, with speeds falling by nearly 90%.

This slowdown directly impacts Solana’s core design. The network relies on high throughput and low latency. Therefore, heavier cryptographic data introduces operational friction across validation and storage layers.

Beyond performance, Solana faces an additional structural concern. Unlike Bitcoin and Ethereum, it exposes public keys directly. This design increases vulnerability under a quantum attack scenario.

Pruden explained that a quantum system could target any wallet immediately. It could then attempt to recover private keys without delay. This exposure makes early mitigation efforts more urgent.

Meanwhile, research from Google and academic teams has intensified industry discussions. Their findings suggest quantum systems could break current encryption methods faster than expected. As a result, several blockchain ecosystems have begun evaluating long-term responses.

While full upgrades remain complex, some developers are testing interim fixes. One approach involves “Winternitz Vaults,” which aim to secure individual wallets. This method avoids immediate network-wide changes while offering targeted protection.

Meanwhile, Solana continues active experimentation. Pruden noted that the project has already deployed a working testnet with quantum-resistant signatures. This places it ahead of many ecosystems still in early discussions.

However, broader adoption remains limited. Coordinated upgrades across validators, developers, and users present ongoing challenges.