# Optimistic Rollups As any user would expect from traditional online poker services, PokerDAO provides a fast, intuitive, and enjoyable experience. However, this presents a challenge when dealing with blockchains with continually increasing congestion and gas fees. To address this, we turn to Optimistic Rollups: an OVM Layer 2 solution that runs parallel with the main Ethereum blockchain. Optimistic Rollups work efficiently by assuming every state change to be valid and only producing fraud proofs if a state root is challenged within 2 weeks of the transaction. Users can challenge suspected fraud by providing valid state roots and accompanying Merkle proofs. This enables huge increases in transaction speed (up to 200 times more transactions per second than Layer 1 blockchain solutions can achieve) while still providing users with the necessary tools to combat potential fraud. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://pokerdao.gitbook.io/knowledge/the-tech/tech-overview/optimistic-rollups.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.