How to make a scene with lots of objects smoother

Development Rendering
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1

Help with making this scene run smoother, any tips?

My scene is very laggy and has a lot of big objects. I think of major AAA games and they have thousands of objects in one area, though mine only has 5% of that. Why is this happening and what do big games use to counteract this?

2

Firstvof all try to build lightning

3

open up profiler to monitor the performance. It will tell you why it is slowing down

look at how many draw calls there is