How do I load portions of a layout?

So I'm making a platformer with large levels and that causes performance issues. I split one of them between two layouts that are connected with doors that the player walks through but I would like it to be one layout that loads as you progress. Any ideas?

Thanks for your help!

-Vincent

Yo have you considered using render cells (in your layer propreties) construct.net/en/blogs/ashleys-blog-2/how-render-cells-work-921

Thank you so much! That helped a lot! I had thousands and thousands of static objects lol

The prototype now runs at 60 fps while recording in high quality!