3 points
There’s a npp plugin called Big Files, I haven’t used it but it might be worth a look.
2 points
*
ref. https://github.com/superolmo/BigFiles
also
https://github.com/molsonkiko/HugeFiles
also interesting on this topic
https://www.howtogeek.com/869782/notepad-can-handle-your-huge-text-files-again/
2 points