Do Son 
“ browsers today already do take active measures to conserve resources for pages in background tabs, and many browsers (especially Chrome) would like to do a lot more of this — to lessen their overall resource footprint.The problem is developers currently have no way to prepare for these types of system-initiated interventions or even know that they’re happening. This means browsers need to be conservative or risk breaking web pages.
The Page Lifecycle API attempts to solve this problem by:
- Introducing and standardizing the concept of lifecycle states on the web.
- Defining new, system-initiated states that allow browsers to limit the resources that can be consumed by hidden or inactive tabs.
- Creating new APIs and events that allow web developers to respond to transitions to and from these new system-initiated states.”
“The Fission MemShrink project is one of the most easily overlooked aspects of Project Fission (also known as Site Isolation), but is absolutely critical to its success. And will require a company- and community-wide effort effort to meet its goals.The problem is thus: In order for site isolation to work, we need to be able to run *at least* 100 content processes in an average Firefox session. Each of those processes has its own base memory overhead—memory we use just for creating the process, regardless of what’s running in it. In the post-Fission world, that overhead needs to be less than 10MB per process in order to keep the extra overhead from Fission below 1GB. Right now, on our best-cast platform, Windows 10, is somewhere between 17 and 21MB. Linux and OS-X hover between 25
and 35MB. In other words, between 2 and 3.5GB for an ordinary session.”
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