Why does Chrome "pause" tabs?

Question

Google

If you minimize the browser, or switch to another tab, then chrome starts to somehow suspend these tabs open in the background, or it can close them, and when you switch to them, the browser loads the page again. Tried to set chrome processes to realtime priority, but it doesn't work.
How can I disable these "things"? For a long time there was no such garbage.

Answer 1

2017-03-15: Chrome 57 restricts background tabs to 1% CPU, prolonging battery life! ( tyts )
Turn off here:

chrome://flags/#expensive-background-timer-throttling