Solana's mainnet upgrade raising the transaction size limit to 4,096 bytes is a real capacity change, not just narrative. It gives developers more room for zero-knowledge proofs and multi-signature transactions, which matters most for complex DeFi and privacy-oriented use cases.

Market reaction so far is muted: $SOL is $100.43, down 1.06% in 24h and 2.2% on the week, with the broader market cap off about 3%. That divergence — improving throughput versus soft price — suggests traders are still pricing macro and regulatory risk (Clarity Act, stablecoin limits) more heavily than incremental protocol upgrades.

Takeaway: this upgrade expands Solana's design space, but near-term price action is still dominated by market-wide de-risking, not single-chain milestones.