Scientific data. Sometimes I forget that a .txt file I'm working with casually in Igor Pro will cause my laptop to seize violently if I accidentally open it with something else.

It's something I would get excited about - not something I absolutely need. In the past decades so much effort has gone into optimizing rendering speeds for computer games or page rendering on browsers while text editors appear to have pretty much stayed the same (rendering wise).

Well, I can understand optimizing rendering speeds for computer games because the general trend has always been wanting ever more realistic graphics.

However, it's surprising to see people want more rendering speed on their text editors, especially to the point that it would excite them. It's something I've never considered them lacking for their purpose. However, that's probably because I've (nearly) never had the need to handle text files with such characteristics (I usually use it for code and configuration files; none get even close to 1MB), and so to me the text editor is among the fastest, lightest programs I typically run.

rch mentioned scientific data. I guess it's a valid point that there are people working with huge datasets in a practical text file format, and if there are people that can work with huge images or videos on their editors, then why can't text editors do the same.