The speed of NFT transactions is guaranteed through the blockchain technology on which they are built. NFTs are typically built on top of the Ethereum blockchain, which uses smart contracts to execute transactions automatically without the need for intermediaries. When a user initiates an NFT transaction, it is recorded on the blockchain, and the network of nodes within the network validate and secure the transaction through a process known as mining. The mining process involves solving complex mathematical equations, which helps to ensure the accuracy and security of the transaction. As a result, NFT transactions are typically completed within a few minutes, and users can be confident that the transfer of ownership is final and irrevocable.