Lag world generation

Hello, I wanted to create a world generation in construct 2, but when I tried it, the game created more blocks than I wanted and it got laggy...

Well of course it would create more and more blocks every 0.5 seconds, because each new created block will trigger event #1 and spawn 4 more blocks.

What exactly are you trying to achieve?

So, I wanted to create a top-down world generation, which would create this grass and, later on, add more elements like sand and stone. How to remove spam? Thanks

I suggest you use a Tilemap instead. You can pre-fill it with grass tiles in the editor, and then spawn other objects on selected tiles.

A single tilemap will be massively better for performance than a thousand of small sprites.

Check out the built-in examples in C3, there are lots of demo games which you can use a template for your game.