Finder (open/save/browse) annoying freezes

Whenever i use any program, say Word and wanting to either open/save/brown a file, it opens a Finder window for me to look for the file on my computer, and everytime this Finder pops up, it freezes slight for about 10 seconds when i am unable to scroll or click anything, then it works.

What is causing this? seems like its taking time to load something?
This is a small problem thats not really a big deal, but it does get annoying.