From September 11th, 2016 to November 24th, 2016, 100% user give 5-star rating. for tabsleeper chrome extension.
exactly what I was looking for. thanks
As of 2016-09-11, this extension works as claimed with no side effects. The use case is to "sleep" tabs one windowful at a time, with the ability to bring them back quickly whether you're currently online or not. While they're asleep, the tabs don't consume any computational resources aside from the necessary disk space. This is useful if you're in a situation where your open Chrome windows slow down your computer. I have independently reviewed this extension's code and haven't seen any surprising or malicious things.