Why not just use python, why reinventing the wheel necessary? From most developer experience GD script isn't faster. Also that website is not official Godot website. It's a domain grab of a someone learning Godot.
I still didn't like it since it doesn't have JIT nor AOT to speed up code. That's why Godot C# is even faster than GDScript at many scenarios
How does GDScript compare with Starlark?
The official GDScript language documentation is here:
https://docs.godotengine.org/en/stable/tutorials/scripting/g...
Registering gdscript.com and boasting about its search ranking is just gross.