How chromium Site Isolation and process allocation works for Iframe?


I was with working with a website it contains 6-10 Iframes, Each Iframe contains a web app so obviously there are high chances of that my website get slowed down. So to fix this I tried to understand chromes processes allocation model, I spent hours of time on understanding their model. And what i think is that they create new process for every same same cross orgin iframes and they use the parent process if it is same site same orgin iframe. But here I’m confused with what exactly is a orgin (is subdomain(+1,+2) considered), ?

Also I cant understand what exactly does Origin-Agent-Cluster do in process allocation. Should i go for single process or multi process iframes, and how to do that..

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