How do I read Google Chrome Coverage report?

[Goran Tepšić]

For example, I have this Coverage report snapshot:

It says that page load is 2.5MB of bandwidth though the Coverage report says there's more unused code (3.3MB) than the entire loaded page so I'm like, how it's possible?

Also, what is the difference between Filtered and Total unused code in the status bar?

What is being filtered out?