Fastest and most efficient way to read from file

Question

I want to make a GameEngine with C++ and OpenGL.
until now I have seen different ways of reading from files,
and since I'm a bit newbie,
I don't know what is the fastest way of reading from files to save (a bit of) performance,

There are 2 ways that I know how to do it: https://code.sololearn.com/cr2RsNJTNo9M/#cpp
I want to know if you know a better way, or if these 2 are good enough which one is better.

Answer 1

https://stackoverflow.com/questions/17925051/fast-textfile-reading-in-c