In knowing many priests who had been around for the switch from latin to english, I have heard them comment that the latin was just simply rote and monotone for them, so they just went at a pace that was comfortable. I myself have studied six languages, including latin, hebrew, greek, spanish, aramaic, italian, and a bit of gaelic.
Learning a language is more than learning vocabulary. To really have a “feel” for a language you have to almost have a certain mind set, and start “thinking” in that language, to be able to effect idiomatic expression, accents, and flow. This is the problem with latin mass. not only do people not understand or speak latin, but to learn it takes time. I found myself that it takes either an immersive experience or several years to be able to use and interact with a language effectively, and feel a personal connection to it.
Imagine if starting today you had to put all your verbs at the end of a sentence or at the end of each clause. Does Yoda ring a bell? This is how Latin works. “To the store I am going.” or “at the store after the game I am having been.”
One thing I do know is that priests were told to carefully pronounce the words of consecration…one old Pastor I had would say the prayer like this
(said very fast with no breathing in monotone) "onthenighthewasbetrayedhetookthecupintohissacredhandsandsaid (pause) this…is…my… (im leaving the last word out, out of respect)…thebloodofthenewandeveralstingcovenantwhichwillbeshedfor…and off to the races again. He would finish a Mass in about 30 minutes, homily included.
The first latin mass I ever attended was said by him, by special permission, and I was happy to go because I had two years of Latin under my belt (was an A student) at that time. he was even faster than he was in English and I did not understand a thing he was saying, It was monotone all the way.