interesting gavra. i never heard that. ive seen quite a few Gedolim daven, i never saw one daven “quickly”
i wonder if you perhaps misunderstood them, or they were referring perhaps b’dieved for someone who is having trouble with Kavanah (im just guessing here).
if anyone is familiar with this and knows who said it and what exactly they meant i would be very interested.
thanks for the info gavra.