Turn ofon line searching

Hi I have folders on my PC containing 300+ generic films (They can be found on http://www.themoviedb.org/) together with associated XML and metathumb files this I can browse slowly using a 3X3 grid pausing on a icon gets online info On other views this grinds to a Holt
Oher folders contain non generic mp4, typically 10 minutes clips, is painfully slow

I think it because each file is being searched for on-line
Is there a way to turn off fetching on line searching