It’s been reported by some users that the file explorer is running slow and it takes a great amount of time to fully load all the files from a folder.
Perform a System File Checker scan, by pressing Windows key + X button together. After this, tap on Command prompt and then type SFC / scannow. Press enter.
However, if this doesn’t help, you can try disabling the windows search in MSConfig.
But the problem with this is that it will keep showing you a warning regarding searches, which will be slow, so this might be a bit uncomfortable and annoying.
Another thing that might help you, is, as well, not an ideal solution, but it’s the best until Microsoft fixes this bug. Get the File Explorer icon as a quick launch on the bar that’s at the base of the screen. Click Right on it and select File Explorer. This thing will open a new File Explorer window and it will allow you to see your files. You can, after that, close the first File Explorer window that proved to have problems loading the content.
You can also try to clear the thumbnail cache, it might help you a bit.
Also, think about the fact that this might be a warning regarding a corrupt file, which can be among those in your folder. Try and run dism. After that, run the SFC /scannow again and see if it works this time. Also, get rid of all the things that you don’t need in your startup.
If they won’t help you solve your problem, also try Opening Windows Explorer. Click on File, then Click on Change Folder and Search Options. Press View and look for “Launch folder windows in a separate process”.
Just reinstall Windows 10. It might take some time, but it’s probably it will fix the problem forever.