(adsbygoogle = window.adsbygoogle || []).push({}); if i delete it what does it do

If your talking about the in the options?It makes games load faster,if you mean browser it is like the site history or something.

A cache is the history and all the updates to any games. If you delete it, you will loose your updates for your PSP and your histroy on the browser.

It isn't updates actually just browser history.