Despite the fact that crypto transfers work almost instantly, all the blockchains have different time to generate blocks and push the transactions in. Besides the specifications of a taken network, transaction speed can be influenced by:
The network being “busy” at the moment
Large transfer volume
Increased fees
Problems with nodes
https://swapzone.io/learn/how-to-exchange-crypto-fast/The thing is that fastest blockchain is not really the priority but we need adopted and accepted blockchain which is only ethereum blockchain at the moment. Yes it has its issues but soon when new version launches we will see better and more efficient eth network.