Solana Rolls Out Anti-MEV Update Ahead of Holiday Volumes
Noah Patel
November 19, 2025
“Builders wanted this before year-end NFT drops—randomizing order flow is cheaper than absorbing another halt,” said Priya Kannan, CTO at validator collective DeltaBay.
What Solana Enabled
Core developers pushed an anti-MEV patch into validator clients, adding randomized leader slots, minimum delay hints, and stricter gossip filters. The release seeks to reduce priority fee races that have pushed retail swaps off-chain when bots dominate mempools.
The change was fast-tracked after heavy airdrop activity last week revealed latency gaps between data centers. The foundation warned that nodes running outdated clients may see decreased voting rewards as the cluster prioritizes compliant validators.
Key Dates and Deadlines
Validators are expected to upgrade by November 21 at 18:00 UTC ahead of the next epoch rotation. Enforcement toggles on automatically at slot 255,900, meaning any laggards could be kicked to the delinquent set during peak weekend volumes.
A follow-up hotfix is penciled in for November 26 to tune fee markets based on telemetry from the first rollout. Client teams asked operators to keep alert channels staffed because the randomness module could surface new edge cases.
Network Impact
Early canary validators report narrower fee spikes on NFT mints and fewer bundle collisions. DeFi protocols hope the patch steadies oracle latency, which has drifted during heavy arbitrage cycles.
Traders remain cautious after prior upgrades strained RPC providers. Some market makers are staging orders across centralized venues to hedge against any temporary throughput drops while the upgrade settles in.
Builder Playbook
DApp teams are revising transaction batching logic to account for leader randomization and testing fallback relayers. NFT launchpads are scheduling dry runs with smaller allowlists to validate how wallets surface fee prompts.
Validators are advised to pre-download snapshots and monitor CPU load after enabling the patch. Those running custom MEV filters should check compatibility to avoid redundant throttling that could slow block propagation.
What to Monitor
Watch for updates from major RPC providers on whether they will mirror the randomness changes in their rate limits. Price feeds and liquidation engines should be observed for any latency drift during the first epoch with the new rules.
The foundation said it will publish telemetry on sandwich activity next week. If attack surfaces shrink without hurting throughput, the team may keep the randomized schedule through year-end.