There are two simple solutions:
1) Get a better computer that can actually handle the load during prime time when "everyone" goes nuts and zerg even B-ranks
2) Do your hunting at other times

Your complaint is like... someone designs a bus for 50 passengers, but you decide to cram in 100+ passengers and proceed to complain that the bus runs badly.

Calm down, take a deep breath, and if 1 and 2 is not "acceptable" to you, wait a week or two for the most impatient people to get their stuff and there will be much less people doing it at prime time.