Public bug reported:

pluma is extremely laggy, to the point of being borderline unusable.
Each character takes approximately 1 second to appear after being typed
(some faster, some slower).

Ubuntu MATE 18.04
CPU: Intel i7-8700K (99% idle)
RAM: 16GB (14GB free)
Keyboard: Lenovo USB keyboard (wired)
GPU: nVidia GTX 960, with proprietary driver

Version: pluma 1.20.1
Plugins: None enabled
Syntax highlighting: Plain text
File size: Happens with a new file (completely empty), i.e. File > New

Recreate:
1) Open pluma (don't open a file, just pluma)
2) Start typing

Additional info:
I didn't have this problem under 16.04, but I know there were major MATE 
changes since then (gtk2->3)

** Affects: pluma (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1792817

Title:
  pluma input lag (very slow)

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