Does OS X save thumbnails?

When accessing a folder with lots of jpg images, I don't recognize any loading time to preview the pictures in the folder. However, when I open a folder with lots of movie files in it, it always takes some time for OS X to load the preview thumbnails.
Does OS X save JPG or movie preview thumbnails somewhere in the system?

I used to run 10.5.4 and had all my videos display in icon view with thumbnails.
Now since upgrading to snow leopard many of my videos in icon view have no thumbnail , just a generic quicktime icon . Some do have a preview thumb . sometimes this and sometimes that. I use my macbook for live video mixing and rely on my library to display in icon view . I am currently backing up my user folder in preperation of a HD delete and clean downgrade back to 10.5.4 in oreder to resolve this issue . Can i set the os to generate thumbnails
always? Any help before I take such a bold move ?

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created by John Mensinger in Illustrator - View the full discussion
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https://forums.adobe.com/servlet/JiveServlet/downloadImage/2-6439399-644928/450-397/Untitl ed-1.jpg
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Does OS X save thumbnails?

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