Kbdrate

the command-line program kbdrate affects the pause between your key beginning to repeat, and the interval between repeats themselves.

kbdrate -d 2.0 -r 2.0			## test rate interactively

Once you settle on a speed that you like, you can create a service-file for it:

#### /etc/systemd/system/kbdrate.service
[Unit]
Description=Keyboard repeat rate in tty.

[Service]
Type=simple
RemainAfterExit=yes
StandardInput=tty
StandardOutput=tty
ExecStart=/usr/bin/kbdrate -s -d 2.0 -r 2.0
 
[Install]
WantedBy=multi-user.target
####

sudo systemctl enable kbdrate.service
sudo systemctl start kbdrate.service