Banners/Posters display lag

So for as long as I can remember there has always been a delay when I start to scroll through my TV Episodes or Movies. The banners for TV shows tend to be black for a second with just text of the show name before loading the actual banner image. It pretty much does this for each page as I scroll. Similarly it does the same thing for movie posters while scrolling through those.

I was wondering what, if anything, I can do to fix this situation. It is caused by the HDD that my media is on running slow? I am considering putting an SSD in the system for the boot drive that has Windows/XBMC installed but no media would be on it so I was not sure if this would help at all.

Any suggestions to improve this would be greatly appreciated.