Here is a bit.
One of the attractions for many people, of the celebration of Mass according to the usus antiquior is that there is more silence. I can heartily sympathise with this preference from my relatively rare opportunities to assist at another priest’s Mass in addition to celebrating my own.
Interestingly, though, the ceremonies of the usus antiquior provide little in the way of pauses for silence. The "silence" that people love so much is mostly when the priest is praying secreto, that is to say, he vocalises the words in such a way that he can hear them but others don’t. Thus the "silence" is a more or less determined length of time which comes to an end when the priest reaches the next part that is to be said out loud or sung.
In the older form of Mass, there are three moments where the priest pauses in silence. At the memento of the living in the Canon, he remains for a short time in silence, remembering those for whom he wishes to pray (stat paulisper in quiete). In this case, the rubric explicitly says that he does not need to express the names but may remember them in his mind. The instruction for the memento of the dead says that he remembers them in the same way (though now that the sacred host has been consecrated, he is instructed to look at the host.) In fact, the priest may have many names or classes of people he wishes to remember and may simply recall in general those for whom he has made an intention to pray during his preparation for Mass. When people ask for my prayers, I usually promise to remember them at my Mass in this way.
The third pause for silence in the usus antiquior is after the priest has consumed the sacred host (not after he has received Holy Communion from the chalice.) He is instructed to be quiet for a short time in meditation on the most holy Sacrament (aliquantulum quiescit in meditatione sanctissimi Sacramenti).
The Missal of Pope Paul VI provided for more pauses for silence; though you might not realise this since the overall impression of the Mass is that there is virtually no silence since the Eucharistic Prayer is said out loud, something that Gueranger deplored: Cardinal Ratzinger suggested that an option should be provided for saying it quietly. Very often the Offertory is also said out loud as well, so that the only time when there is a prayer of any length said secreto is before the priest’s Communion. In fact, many priests, I think, feel slightly embarrassed at this and rush the prayer or say it out loud. The pauses for silence are detailed in the General Instruction of the Roman Missal (GIRM – I will refer to the edition promulgated with the 3rd edition of the Missale Romanum in 2002)
I would love to redo the whole piece here, but I would rather all of you go to visit Fr. Finigan’s excellent blog and spike his stats while reading the rest.