I agree that 0.8.1 seemed to introduce some performance issues. I have not figured out how to measure the typing lag either, though this is an interesting methodology: https://pavelfatin.com/typometer/
For me there are several very noticeable flashing issues present in 0.8.2
- Opening and closing folders. When you click the folder name, first the list goes blank, and then collapses.
- Switching between files flashes a blank screen before going to the next file
- Switching from edit to preview causes changes in the text to briefly flash from old to new