I dealt with this recently.
Look in the KDE Control Center, under Regional & Accessiblity, then Accessibility, then Keyboard.
See if either Slow Keys or Sticky Keys are enabled; they shouldn't be for normal use.
I found that if you hold down the Shift key for more than 8 seconds, you'll get a dialog box asking if you want to enable Slow Keys. If you happen to hit just Enter, that will ENABLE slow keys. Pressing Shift for another 8 seconds will give you an opportunity to disable it. (as opposed to having to go through the Control Center).
Hope this helps.
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