Editors and IDEs/notepad-plus-plus

Notepad++

"Notepad++ is a free (as in “free speech” and also as in “free beer”) source code editor and Notepad replacement that supports several languages. Running in the MS Windows environment, its use is governed by GPL License."

If you want features, but are willing to sacrifice them for performance; this is the editor i'd recommend.

It's a bit past it's time, but there are still PLENTY if plugins!

...Just not much in the way of anything that's new...

It's written in C++, so it's low level enough to handle your large files without trouble.

It's just missing many of the features that have since become common, such as a "HUD" / "context menu"

It's perfectly fine, but you'll have a harder time finding support for it than others.

Full and Official documentation available at: https://notepad-plus-plus.org/