I was thinking the same! That all the word processors from the 90s must've already figured this stuff out, and half those people must still be at MS. But that k

I was thinking the same! That all the word processors from the 90s must've already figured this stuff out, and half those people must still be at MS. But that knowledge probably wasn't passed on somehow. Although I have to say, Monaco and VS Code have always felt performant from day one. And that shows the difference between the MS and Github pedigree. This is speculation but there was probably more "CS" applied to the Microsoft implementation from the beginning, them having so many compiler people and CS-trained people, than on Github's side. And Github arrived at that through iterations over the years, them having more of a web developer DNA.