RELATED: Learning to Use the Registry Editor Like a Pro And definitely back up the Registry (and your computer!) before making changes. That said, if you’ve never worked with it before, consider reading about how to use the Registry Editor before you get started. This is a pretty simple hack and as long as you stick to the instructions, you shouldn’t have any problems. Standard warning: Registry Editor is a powerful tool and misusing it can render your system unstable or even inoperable. To change the speed of (or disable) taskbar thumbnail previews, you just need to make a quick edit to the Windows Registry.
Control Taskbar Thumbnail Previews by Editing the Registry Manually
