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
If it’s a temporary bug, they will get rid of it in the next couple of releases. But if not, well Obsidian is only in Beta: if it’s not fast now it will only becomes slower. It’s enough that Obsidian is an Electron app, we don’t need performance regressions moving forward. I’m switching from Evernote to Obsidian and performance wise, there is a clear gap.