How do I add a big light source?

I’m not very familiar with how light sources work in GDevelop, please be patient with me. I’m making a 2d platformer and I’d like the platforms (and all other objects) to cast shadows. The game takes place outside, in a forest, and the sun would be the light source.

However, if I use the Light Source function/object shown in the picture and make the light big enough to simulate sunlight and cover the whole level properly, it obviously makes the game lag. I’m sure that’s not the proper way to do it.
How should I go about adding shadows and/or a light source to the game?

Do you suffer from the same lag if you add that huge light to one of the example projects?
I tried adding a large 1500px light, I didn’t notice a lag. How big was yours?