When evaluating the transaction speed of cryptocurrencies, you should consider both the platform processing time and the network confirmation frequency, not just block time. Bitcoin is highly compatible but may have unstable speeds during network congestion; Litecoin offers more stable confirmation intervals for simple transfers; Ethereum has fast confirmation speeds but with larger fee fluctuations. For payments with higher time sensitivity, choose the network based on your priority for transaction predictability, the type of transaction, and the number of confirmations required by the platform, because "speed" is a comprehensive reflection of processing speed, current network conditions, and fee levels.