When comparing blockchain speed, block time is one of the most revealing metrics. Polygon PoS produces a block every ~2 seconds, while Ethereum's mainnet produces a block approximately every 12 seconds following its merge to proof-of-stake. This gives Polygon a roughly 6x speed advantage in raw block production.

However, the comparison goes deeper than raw numbers. Ethereum achieves "probabilistic finality" — the more blocks that build on top of a transaction, the more secure it becomes. Polygon, by contrast, uses a modified consensus that achieves near-instant finality on each block, meaning a single confirmation on Polygon is generally considered final for most practical purposes.

Polygon functions as a Layer 2 scaling solution alongside Ethereum, facilitating quicker transactions and lower fees while maintaining full EVM compatibility.

Chainspect

For transaction cost, Polygon's faster block time combines with its high throughput to keep gas fees extremely low — typically fractions of a cent — compared to Ethereum mainnet where fees can spike to tens of dollars during congestion.

The trade-off is security model: Ethereum's mainnet has a larger, more decentralized validator set, providing stronger Sybil resistance. Polygon periodically commits "checkpoints" — Merkle roots of transaction batches — back to Ethereum mainnet, inheriting a degree of Ethereum's security for final settlement.

For applications where speed and cost matter most, Polygon's 2-second block time represents a compelling upgrade path from Ethereum, especially given full EVM and Solidity compatibility allowing developers to deploy existing contracts with minimal changes.