Alternating lines converging at one point is as time efficient as the altar rail.
It may be actually be a little quicker depending on the use of servers and the paten.
Does your priest make allowance for those that stand?
Of course, both postures are permitted at the receipients choice, per the GIRM. Such a person simply stands at the communion rail.
I see that the Precious Blood is not a option per your description.
Actually, it is impossible to recieve Holy Communion without recieving the Body, Blood, Soul and Divinity of Christ, even in the form of a single species. So yes, everyone present who recieves recieves the Precious Blood, along with the Sacred Body and Soul and Divinity of Christ.
If you are referring to recieving the species of wine, the Eucharist is offered intincted by the priest. (which again has time savings, along with the reduced need for additional ministers to offer a second species.
8-10 people will distrubite Holy Communion 4-5 times faster than two , all things being equal.
Yes, assuming that everything was equal. But I was not comparing equally time efficent means.
In one, the line, time is wasted as the person in front clears out for the person behind them. If the species of wine is offered via the chalice additional time is further lost.
Your point about two lines converging would reduce the wasted time
But add into that, the time needed to distribute additional vessels to the additional minsiters. At your next Sunday Mass, observe the ammount of time it takes to offer Communion to the EMHC’s and to distribute vessels.
And then there is the time spent purifing these vessels after the conclustion of Holy Communion.