It costs like $3/mo to host it. If that’s too resource intensive then I don’t know what your limits are. Compute isn’t free—that literally breaks the laws of thermodynamics, no matter what you’re told by hosting services, and ghost does server side rendering and has a dynamic admin dashboard and can even work headless… and it costs less than $3/mo for your own personal open source cms.

If you need something that costs less then you can just build your own I guess, but how many hours of your time is that worth when you could just be spending $3/mo. If you make minimum wage at $7/hr one hour of work gets you two months of running a website.