I feel compelled to bring up this tweet from John Carmack I just saw a few hours ago. The most popular editor on the planet feels laggier than stuff Borland made in the 90s, on hardware probably a thousand times as fast. I don't know how anyone can say software is great with a straight face.
We have supercomputers in our pockets and on the slightly aged phone my dad refuses to upgrade from four years ago many apps lag. They display like 5 widgets or 20 rows of items at any given time
As someone that used all their products from MS-DOS, through Windows 3.x days up to switching to Visual C++ 6.0, I clearly remeber code completion, syntax highlighting and macros, three features that Notepad isn't capable of.
As easily proven, by reading the manuals available in Bitsavers.
So replace Notepad with Notepad++ in my previous comments. There are definitely fast editors that do the same thing as Borland editors did back then the ones like VSC do a whole lot more and support a whole lot more.
It was a DOS, Turbo Vision application.