Why Magento2.2 create "_cache" Directory under pub/static/_cache

Question

Just want to know about _cache Directory which is generating under [root]/pub/static/

I have noticed that once upgrades, compile & deployed command done through CLI then _cache directory is creating.

What is the purpose of this _cache directory?

Is it Specific for Production mode?

Will it help to increase performance of JS and CSS?

Thanx in Advance!!

Answer 1

_cache folder at pub/static is created when you enable CSS/Js minify or merge.

During Static content deply if this merge/minify setting enables then the merge and minify CSS and js is generates at the store at pub/static/_cache and it creates Website Speed.