And when it comes to being the fastest, this also is arguably not true also, because there are times that Bitcoin transactions can be very slow, especially during memepool congestion, or when your TX fee is way too small, people who uses self custodial wallets would understand this more, when your fee is way too small, you might even wanna stop using Bitcoin to send money across to others due to the delay.
Is this actually the problem of bitcoin or rather yourself? If you want fast transfer on bitcoin you simply just have to pay the high priority fee which gets your transaction into the next available block but choosing to pay with a very low fee and getting your transaction stuck is definitely your own choice in my opinion. Transactions are prioritize based on fee. It is best to use wallet that can be able to make you customize your fees when initiating transactions and this also gives you ability to use RBF to increase the fee later.
The actual thing you’re supposed to say is even if one chooses the highest priority fee and the transaction is actually included into the next block it sometimes takes some time for the next block to be found, even surpassing the average 10 minutes of the network and this is the delay it has that can be blamed on the network not the delay due to low transaction fee