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Set Keyboard Repeat Delay and Rate
From Gentoo Wiki (test)
If you are working with Vim for example, navigating through text can be much faster with a higher autorepeat rate.
Generic X11
You can use the xset command to set 400 milliseconds delay and 100 repeat rate.
user $xset r rate 400 100KDE Plasma
Open System Settings and navigate to Input Devices module, then Keyboard. Set Delay and Rate to your preferred values.