How do I reduce useless rendering on server side?

I have a multiplayer game with open world. When releasing i export separetely client via html to web and server via NWjs. Is there any way to reduce render work on server to increase perfomance? Because when server launched its only shows some texts and its no need to render all other stuff on server side, only calculate collisions and etc. Ashley , is there any export way or trick for that?

According to the manual off screen objects aren't still rendered. You could place anything off screen that you don't want rendered, then when it's time to see them place them back on screen. Read the article below to double check. Also if you have lag issues elsewhere the entire first section, in the overview, is about efficiency, proper image use, and stuff like that. Hope this helps.

https://www.scirra.com/manual/134/performance-tips

Just make all layers invisible, but you should probably leave one information layer visible so you can see what it's doing.