It is acting super slow for me too. I don't know how fast my media is, but the update is stlll going (319/999) and it has been around 5 hours so far. I don't see any zombies but top shows almost nothing. uptime is showing a load of like 3.x and the gui is hung with a black screen. Apparently sshd just stopped responding as I was typing this before I could poke through the logs. free was still showing a lot of free memory.
Btw I am also thankful F25 is out and I can match my desktop.
From: linux guy <email@example.com>
To: Peter Robinson <firstname.lastname@example.org>
Sent: Monday, January 30, 2017 5:12 PM
Subject: [fedora-arm] Re: RPi 3 extremely slow with F25. Extremely !
dnf list was much faster after the first time.