Slow file listing when connecting

I have a folder on the server with more than 10,000 files. When I switch to that folder, it will be shown in around 5 seconds. This is fine for me. However, when disconnecting while this folder was selected and reconnect, it takes 80 seconds to show the files and the app is frozen during that time.

Would be great to get some help how to fix that or seeing it fixed in a new version.
Cheers
Daniel

Forgot the information about my system and installation
WinSCP-Version: 5.9.4 build 7333
Windows 10
Protocol: SFTP
GUI using Commander

Thanks for your report.

Can you send me an email, so I can send you back a debug version of WinSCP to track the problem? Please include link back to this topic in your email. Also note in this topic that you have sent the email. Thanks.