The way I see it, if you're rolling more than one d20 on a skill check you're already doing too much.
Think of it this way.
Pathfinder Skill Check: Roll a D20, add/ subtract Modifiers, you equal or exceed the difficulty, you pass, otherwise you fail (or get a partial success)
The Dark Eye Skill check: You have to look at a chart of what 3 attributes apply, roll 3d20 and then compare them to those 3 stats. You then have to fiddle with skill points to buy up values you don't hit or roll under on a d20. There is also a fiddly thing of math where odds are some of your rolls will be high and you have a 15% of botching one of your die rolls (As a Natural 20 in the system is pretty much an automatic failure). That seems like a lot of work to me. It would have been better for a PC to justify one attribute to roll based on the circumstance and if the GM agrees then do a single d20 roll, one and done. This allows better narration rather than pouch-screwing most PC's on their actions.
Having played and DMed both I have to disagree: although it might look as it is more work to roll for a skill check three dice instead of one to obtain a result, Pathfinder on the other side tends to become way more cumbersome compared to TDE for the combat part - especially at high levels.
In PF you roll one die, then you need to apply various modifiers to the roll, remembering which is the source of the modifiers so that they are not stacking against rules, remembering to subtract various resistances, remembering to divide the damage according to the source in case an enemy has a partial resistance to the damage, etc... All of this brings in a lot of math and memory effort.
Furthermore the preparation a DM has to put in PF combat is - for my experience - higher than in TDE.
In TDE you roll one dice for attack, apply a couple of modifiers related to weapon used and type of combat ground (making the combat more strategic than PF, imo), the defender gets a roll to parry/evade, apply damage, the end. And it is like this also at high levels, so once you have learned (matter of one session) you are good to go for the rest of your life.
TDE has for sure a BIG drawback in the amount of time you need to prepare a character sheet - which in Pathfinder is way more straightforward - and, yes, rolling three dice for skill checks might look more slow.
But, in the end, it's just three rolls.
On the other side, I remember entire stessions of Pathfinder dedicated just to A single combat, due to the amount of effort you need to put in; something that I have not seen in TDE.
With this I don't want to say one system is better than the other, they are both goods for different reasons: want to play an epic campaign in which you are the hero with dozens of magic items? Play Pathfinder.
Wanna play a more realistic and deadly system, where you have to value a lot the choices your character makes, as they might influence his survival? Play The Dark Eye.