Mouse Arrow moving Slowly Using keyboard Keys

I use these commands:

sudo apt-get install xkbset
xkbset ma 60 10 10 5 2

It's more than likely the delay that you have set for they keyboard repeating keys.

1. Go to "System Settings"
2. Click on "Keyboard"
3. Lower the "Delay" slider under "Repeat Keys"
4. Raise the "Speed" slider under "Repeat Keys"

Comment back if this doesn't solve the problem.

Use gsettings to change the speed parameters keys.

• To find these keys I used:

  gsettings list-recursively | grep keyboard | grep mouse
  

  I found:

  org.gnome.desktop.a11y.keyboard mousekeys-max-speed 10
  org.gnome.desktop.a11y.keyboard mousekeys-init-delay 300
  org.gnome.desktop.a11y.keyboard mousekeys-accel-time 300
  org.gnome.desktop.a11y.keyboard mousekeys-enable true
  

• To know what each key does I use:

  gsettings describe org.gnome.desktop.a11y.keyboard mousekeys-max-speed;
  gsettings describe org.gnome.desktop.a11y.keyboard mousekeys-init-delay;
  gsettings describe org.gnome.desktop.a11y.keyboard mousekeys-accel-time;
  gsettings describe org.gnome.desktop.a11y.keyboard mousekeys-enable;
  

• I performed the following procedure to change these keys:

  gsettings set org.gnome.desktop.a11y.keyboard mousekeys-max-speed 2000;
  gsettings set org.gnome.desktop.a11y.keyboard mousekeys-init-delay 20;
  gsettings set org.gnome.desktop.a11y.keyboard mousekeys-accel-time 2000;
  gsettings set org.gnome.desktop.a11y.keyboard mousekeys-enable true;
  

These key values ​​are personal, you must enter the values ​​that are suitable for you.

The image below shows how to control your cursor:

Source: https://www.repairwin.com/wp-content/uploads/2019/03/image-8.png