Is he talking about the industrial backhoe model, I don't know the current number, its got a big pump.
I've got a
L5030 as well, its loader is nice and fast. In an HST model the loader is usually quite fast as the engine (and pump) are turning at high rpm all the time.
A gear model, when say doing loader work is being driven using the pedal and returns to idle instinctively when the tractor isn't moving. This slows the pump and loader down.
You do learn to rev the engine when raising the bucket all the way but it takes a bit of practice, especially in a place where you need to keep the brakes on.
Woodsplitters, it depends on the size of the clyinder. I have a monster 6" bore one, you need to idle the tractor at about 2000 rpm to work at a good pace. A normal 4" cylinder works well at just a bit over idle (on a 10 gpm rated machine)
Hydraulic posthole diggers, if you have any rock, you won't be running it at anything but low speed, so it really isn't a problem. If you have hundreds of holes, and rock free soil, you might want to do it faster?