Gamedev creating extensions for GDevelop, a no-code, open-source game engine. Tutorials and examples on Youtube.

Create thousands of objects to see how they impact the performance of the game.
In real games, consider staying under these limits:

Sprites:
 
Desktop < 10,000
Desktop (with physics collisions) < 1,000
Desktop (with collisions) < 500

Mobile < 5,000
Mobile (with physics collisions) < 500
Mobile (with collisions) < 250

Tiled Sprites:

Desktop < 1000
Desktop (with physics collisions) < 1000
Desktop (with collisions) < 1000

Mobile < 100

Particles: 

Desktop < 15,000
Mobile < 5,000

Load Testing GDevelop