A few weeks ago:
VS Code uses 13% CPU when idle due to blinking cursor rendering
I don't think I ever had a "IDE causing high CPU load in" problem in Delphi 2, 3, or 5. I did in Delphi 4, and I have in PowerBuilder, Sybase PowerJ (although there were much worse problems with that!), VB6, Eclipse 2, and I'm sure there are some I've missed.
Bugs suck, but they happen.
[1] http://ridikulouse.blogspot.com.au/2015/02/visual-studio-hig...
[2] http://stackoverflow.com/questions/1369487/speeding-up-tomca...
[3] http://stackoverflow.com/questions/38601171/intellij-idea-20...
That has not been my experience with any electron app. They are dog slow across the board
I'll stick with emacs for now, until I finish writing my own editor.