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[miauw62]

The trouble isn't the pumps, it's the temperature updates.  If you have the area already covered in magma (ie, already "warm") and push magma through it, there's virtually no lag, just fluid movement.  Magma is such a killer because it's constantly re-updating all the different tiles for heat.

If you just want a quick forge setup, you can turn off temperature briefly.

Or, you can build your pumpstack top-to-bottom, as Nil pointed out (i always forget his name >.< ), and that SHOULD cause no lag.
Well, chris ninja'd me.
EDIT:

How would one build a pump stack from top to bottom? Wouldn't that make the power supply much more difficult?

Well, you could just dig a tunnel straight down and fill it up with gears to supply power, but i know what to prefer, a simple problem to solve or no lag

[Jingles]

If you remember to put a drain at the top of the stack you can pump out all the magma to make modifications later on by sealing the inlet and pumping all the remaining magma into the drain.

Here is my pump stack which followed the design in the thread you linked: http://mkv25.net/dfma/poi-29219-bottomofthepumpstack  It works great.  Just make sure to put the stairs a tile further out as I accidentally built them too close for a full 3x3 basin on one side.

[San-A]

Here is my pump stack which followed the design in the thread you linked: http://mkv25.net/dfma/poi-29219-bottomofthepumpstack  It works great.  Just make sure to put the stairs a tile further out as I accidentally built them too close for a full 3x3 basin on one side.

many thanks! that's brilliant

[Andrakon]

How would one build a pump stack from top to bottom? Wouldn't that make the power supply much more difficult?

Channel a hole one level above the top most pump, build a horizontal axle beside the hole and put a gear assembly on the hole. The horizontal axle holds up the gear assembly and the gear assembly will hold up any pumps built below it.

[Andrakon]

I prefer to use a magma piston rather than a pump stack.

http://dwarffortresswiki.org/index.php/Magma_piston

It is a bit hard to understand at first but once you have figured it out once it is easy to make. I use these all the time. Takes about a year and a half in game to make and I get enough magma to run all of my smelters and stuff plus extra. I usually bring up 3 zlevels of magma in one go. Also you can make it reusable if you want.

The general idea is to exploit the cave in physics. Drop a 100z level or so tall natural pillar into a dug out basin I manually filled with lava. The screwy physics causes the lava to teleport to the top of the pillar. Use bridges 2 or 3 levels below the top of the pillar to catch all the lava. The bridges won't hold up the pillar.

[Werdna]

This post from the original thread explains why 3x1 instead of 2x1.  The presence of magma in the squares on either side of the intake square keep every tile the intake square touches warm, regardless of the intake square's current magma state, so no recalcs are needed when the intake square occasionally hits 0/7 magma.  A 2x1 would work and be an improvement over the old 1x1 design, but would still leave a few tiles on the other side of the intake square subject to temperature recalcs.