OpenGL GLUT naming variables and functions

Does naming functions and variables long names slow down a program? For example
I mean even a nano speed difference in these two functions

void GetMouseMovementXY(int x, int y)
{
MouseAngleX -= (x - OldMouseXcoordinate);
OldMouseXcoordinate = x;
MouseAngleY -= (y-OldMouseYcoordinate);
OldMouseYcoordinate = y;
}

Vs

void motion(int x, int y)
{
AngleX -= (x - OX);
OX = x;
AngleY -= (y-OY);
OY = y;
}

No.

Also: general programming questions not specific to OpenGL are considered off-topic for this board.

Well im asking because im guessing if they were named long enough it would matter to OpenGL specifically too. I want to know if it makes literally no difference in OpenGL C++.

“OpenGL C++” is not a thing. To C++, OpenGL is just a library.