How do you optimize performance in Unity?

Optimizing performance in Unity is crucial for creating smooth and efficient games, and reducing draw calls along with using lower resolution textures significantly contributes to this goal.

Reducing draw calls is essential because each draw call requires the CPU and GPU to process and render objects in the scene. By combining meshes or using techniques like batching, developers can reduce the number of draw calls, leading to improved performance. Lower resolution textures also play a vital role; high-resolution textures consume more memory and can slow down rendering, especially on lower-end devices. Using appropriately sized textures ensures that the game runs smoothly without unnecessary memory usage.

The other options would not effectively lead to performance optimization. Increasing the number of active GameObjects can actually strain performance rather than enhance it, as each GameObject adds to the overhead. Randomly placing objects in the scene doesn't inherently improve performance and could result in performance issues if it leads to an unoptimized scene layout. Lastly, using complex shaders for all materials is counterproductive in most cases, as complex shaders can be resource-intensive and may negatively impact frame rates, especially on lower-end hardware. Hence, focusing on reducing draw calls and textures is the most effective strategy for optimization in Unity.