Users often have the habit of downloading a file from the internet and then using it immediately without paying attention to where it is thrown. This is not a problem specific to Windows 10 but was prevalent in previous versions as well. And of course, fixing this issue is not only applicable to Windows 10 but can also be applied to any other Windows version in a similar way as explained in this article.
Additionally, to prevent this issue, if you are using a browser like Coc Coc, for example, refer to the article on changing the file save path in Coc Coc to minimize the recurrence of this problem.
Guide to Fix Slow and Frozen Opening of Download Folder on Windows 10
Step 1: Press the Ctrl+E key combination, and you will see the Downloads folder.
Step 2: Right-click on the download folder and select Properties.
Step 3: Go to the Customize tab, choose General items, check Also apply this template to all subfolders, then click Apply -> OK.
Step 4: Now, turn off and then reopen the Download folder to experience the results.
With this simple trick, you can eliminate the mentioned error, and your download directory will no longer freeze or lag. However, it's advisable to organize your data and delete unnecessary items to ensure smoother performance. Refer to the article on cleaning up Windows 10 without using additional software for further optimization.