Calling web service via HTTP request, for one section : are all datasets computed ?

Question

hello,

I am using .NET 5 to call the SSRS web service, and there are many sections, called one after the other. I wonder if I can speed up downloaded times by putting each section in its own report. Indeed, I read that when calling a page, all the datasets are computed, my question is : if I call one section of a page, are all the datasets of the page computed? If so, is the time reducing significant if I put all the sections in their own page?

thank you.