One caveat for the resource-sensitive - turning on the thumbnail feature will increase the amount of resources being used by the operating system. Those little thumbnails take up space on the hard drive and in memory when they are being displayed. Depending on your system, the available resources, and the number of images involved, you can quickly bog down your PC if you are not careful. This is why many users will be interested in this tip for the opposite reason - they want to know how to turn off thumbnail creation in Windows.
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