My MB Pro doesn’t have enough memory... It’s a major downgrade.
After I went to 16gb kept a memory monitor running for a while. There were times doing various functions I was regularly going into the 10gb range. Firefox is a real memory hog but that isn’t the only one. What happens is it is using your HDD or SSD to page in chunks of memory and that is Slowwwww. Thats about -20000%++ speed hit. That’s why you get those dead pauses. After adding the new ram all those dead pauses went away completely.