Besides, isolating processes will prevent one process from accessing the memory of another process, which also improves the security of the browser.
If the problem occurs on a web page, web app, extension or plug-in, only the problematic process is affected. The rest of the browser, including most other tags, should be fine. This helps to increase the system stability and reliability.
Separating processes makes it easy for the user to see in Task Manager which processes are using the most resources. Besides, it provides information about what is contributing to resource usage. You will know whether Microsoft Edge or a website, extension, plug-in is using the most resources.
You can also view this information in the internal Microsoft Edge task manager by pressing the Shift + Esc shortcut while Edge is open, or accessing the three-dot menu (.)> More Tools> Task Manager browser service.