Entering Text in Kate (or kwrite) in KDE5  -- as opposed to KDE4 -- is very sluggish and unresponsive. The typed text sometimes takes a second to appear.

Running kate through strace shows that whenever kate tries to save the .kate-swp file, it is basically locked up for ~1 second. Since apparently kate saves the swap file nearly after every character, this means that kate is constantly locking up for a few moments before the next typed text appears.

Unfortunately, the entered characters are not even in the correct order. In particular, if I enter:
    if ($ctrsettings["${type}_global"] == 'yes')
then kate actually inserts
    if ($ctrs"ettings[${type}_g"lobal] == ''yes)

In particular, it appears as if all quotes are inserted immediately, while all letters are inserted afterwards, even if they are typed before the quotes.

Reproducible: Always

Steps to Reproduce:
1. Enter some text in kate
2. The first few characters will appear immediately, but the next will appear only after a second