A guitar can measure fine at the 12th fret and still feel wrong in the first three frets. One of the quietest causes is nut slot height.
The first fret tells the truth
If the nut slots are too high, every note near the nut has to be pushed farther than necessary. That makes the guitar feel stiff, and it can pull first-position chords sharp. Players often blame their hands, the tuners, the strings, or the bridge intonation when the problem is actually at the nut.
Why bridge action does not solve it
Lowering the bridge can make the middle of the neck feel better, but it does not fix strings leaving the nut too high. The guitar may end up buzzing higher up the neck while still feeling stiff near the first fret.
The mistake is cutting without measuring
Nut work is permanent in a way many setup adjustments are not. A slot that is too low can buzz open, ping, bind, or require filling and recutting. The goal is clean height, correct angle, and a slot that lets the string move without grabbing.
When nut slots are right, a guitar often feels more expensive than it is. When they are wrong, even a good guitar can feel like work.