This is from September 2016.
I'm sure many editors there have changed since then. This is true of Visual Studio Code, at least - the tests uses 1.4, way behind the current 1.14. I know the team has been spending some time doing performance improvements (e.g. 1.9 had some big improvements in highlight performance[1]) and I wonder how it compares.
1: https://code.visualstudio.com/blogs/2017/02/08/syntax-highli...