Thanks for the info!
Disabling Show live issues indeed restores normal typing. Once Show live issues is enabled again, slow typing returns after a live issue is shown.
Disabling Show live issues, however, is also like going back to an ancient 15-year-old version when Xcode didn't have this feature. The loss of time and productivity would be enormous (for me, at least). That's why, in my view, it's better to just go to an earlier version that doesn't have this issue (Xcode 12 or Xcode 13 Beta 1, if you still have it).
Topic:
Programming Languages
SubTopic:
Swift
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