Should I store GetNode in Ready or in Methods? What is the best practice?

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Should I store GetNode in Ready or in Methods? What is the best practice?

godotMonoNoob

[Godot Mono C#]

When I GetNode, should I put it in the Ready Method and then have fields OR should I only put it in the methods that need it?

Example 1:

private TileMap mazeTm;

public override void _Ready()
    {
        mazeTm = GetNode<TileMap>("/root/Game/MazeContainer/Maze/MazeTilemap"); 
    }
public void AddNodeToTilemap(Vector2 pos)
    {
       mazeTm.SetCellv(pos,node);
    }

public override void _Process()
{
   AddNodeToTilemap();
}

Example 2:

public void AddNodeToTilemap(Vector2 pos)
    {
        TileMap mazeTm = GetNode<TileMap>("/root/Game/MazeContainer/Maze/MazeTilemap"); 
        mazeTm.SetCellv(pos,node);
    }

public override void _Process()
{
    AddNodeToTilemap();
}

Also, if I GetNode in the process function like in 'Example 2', is that worse for performance than doing what I did in 'Example 1' or is that not how it works? OR, is the difference in performance so minimal, I should just do Example 2 as it has better readabillity/ is better for code in some way?