I correctly understand that constants are the fastest?

Question

C++ / C#

I understand correctly that when the game is compiled, instead of constants (for example, "APP_ID = 4444"), he puts the value directly?
That is, the program / game does not need to go to the constant to look at its value, but the value is set directly during compilation?

Answer 1

No.
Modern compilers themselves are able to optimize.
And if you do not change the usual variable, it will also, with a high probability, behave like a constant.
But on average and in general - yes, as you think.
The above only applies to primitive/base types. With some dictionaries-arrays-trees - this will not work.