The pictures and library, the browser keeps?

Good day, when someone comes for the first time on the website, the browser shakes itself in memory all the static files(libraries, images) and in the future he will have to open the website 2 times faster?
For example, if the site weighs 5 MB and the library is also a 5 MB picture.
Question to the large library it's not scary?
June 10th 19 at 15:50
1 answer
June 10th 19 at 15:52
They are compressed as server-side and client-side (browser), with some period cleared. So I think not scary.

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