You already have your answers so please close this thread. IMO though, ETH transaction is not the cheapest and fastest out there. In fact, transactions that are done on other altcoins such as doge is cheaper and faster when compared to ETH so let's not start comparing the two in terms of transaction speed and fees because some altcoins are far better to use in transactions than ETH.You are right that bitcoin is slower because of its popularity(since btc got more volume of transaction per second than eth) but being the oldest doesn't mean that it is bound to be slow because improvements are also being done to bitcoin. Just like what this user said: