How does loading jQuery via CDN work?

Question

JavaScript

I'm testing the functionality of Chrome Developer Tools
Connected jQuery via CDN and watch the file download in the Network panel
I can't understand the logic of the CDN, which, when the cache is cleared, gives this:

and with caching enabled, this:

What does it turn out to be?
You go, you go to school, and then bam - and with the library in the cache, we still spend 100 milliseconds accessing the server?
PS
Parallel question. I understand correctly that these numbers below mean the size of the downloaded gzip archive (top) and its unzipped size (bottom)?:

Answer 1

When checking caching, do not press F5, but ENTER in the address bar, then the request will not be sent.