Isso é abordado na FAQ do Google Chrome:
- How can my web page open a new tab in a separate process?
Google Chrome has a multi-process architecture, meaning that tabs can run in separate processes from each other and from the main browser process. New tabs spawned from a web page, however, are usually opened in the same process, so that the original page can access the new tab using JavaScript.
However, Google Chrome will look for hints to open new tabs in a separate process, if you are navigating the new tab to a different website.
The easiest approach is to use a link to a different website that targets a new window without passing on referrer information. Google Chrome recognises this as a hint to keep the new page isolated from the original page and it will load the new page in a separate process.
Exemplos e mais informações aqui:
link