Yesnt.

If the alternative to changing into a new file is to search through a 40k lines file that has no structure, then I rather go to a new file. As my train of thoughts is interrupted by the size of the file.

And a good compiler is capable of a lot these days. However if you are working on low end hardware that has to perform good and fast then you should of course think about the compiler.

In 99% of software that isn’t the case though