Host
dmidecode -s system-manufacturer
LENOVO
dmidecode -s system-version
ThinkPad T460s
dmidecode -s system-product-name
20FAS23200

Device
smartctl -i /dev/nvme0n1 | egrep "Model|Firmw"
Model Number: CT1000P2SSD8
Firmware Version: P2CR033

Test1
cat /etc/fedora-release
Fedora release 25 (Twenty Five)
uname -a
Linux localhost.localdomain 4.13.16-100.fc25.i686 #1 SMP Mon Nov 27 20:46:38 UTC 2017 i686 i686 i386 GNU/Linux
hdparm -tT /dev/nvme0n1
Timing cached reads: 14900 MB in 2.00 seconds = 7460.67 MB/sec
Timing buffered disk reads: 8314 MB in 3.00 seconds = 2770.59 MB/sec

Test2
cat /etc/fedora-release
Fedora release 34 (Thirty Four)
uname -a
Linux fedora 5.11.16-300.fc34.x86_64 #1 SMP Wed Apr 21 13:18:33 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
hdparm -tT /dev/nvme0n1
Timing cached reads: 16320 MB in 1.99 seconds = 8198.83 MB/sec
Timing buffered disk reads: 6680 MB in 3.00 seconds = 2226.07 MB/sec

Why?