When you’re browsing through your hard drive in File Explorer (aka Windows Explorer), most folders open quickly. However, the Downloads folder, which is one of the most frequent and important places on your computer, often takes 10 seconds or longer to fully load. While you watch in frustration, a status bar in Explorer slowly fills itself for no apparent reason, even if you have a fast computer with a speedy SSD.

The slow-loading Downloads folder problem occurs because, by default, Windows is trying to create thumbnails for photos and videos in the folder, even if none of the files are pictures. With a quick settings change, you can make the Downloads folder open quickly in Windows 7, 8 or 10. Here’s how.
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https://www.laptopmag.com/articles/slow-windows-downloads-folder