Excuse my ignorance but what is cache?
What is a browser cache?
"Your browser saves a copy of every page you visit. Every word, every image. Why? Because it is always faster to load a file from your hard drive than it is to download it from the Internet, and rather than load pages over again when you hit the Back button or revisit a page, your computer checks to see if it already has a current copy of that page. If it does, it uses that instead of wasting time downloading it again."