All folder content loads before it is displayed.

[ostatnibard]

I use Filezilla 3.2.7.1.

1. I connect to some ftp site.
2. Then I double click on a folder which contains ~10 000 files.
3. (Filezilla wants to open the folder and list all files now)
4. So I get a response:

"Odpowiedź 125 Data connection already open; Transfer starting."

5. I wait a looong time and nothing happens.

I think that before Filezilla opens a folder, it loads all file names to the memory. If folder has 10000 files, there is a problem.

My suggested solution:
...make some cashe? or load only those file names, which are on the first screen?

Compare:
Total commander doesn't have this problem.

[Tim Kosse]

The FTP protocol does not provide any means to only load a partial file list from the server. FileZilla has been successfully tested with directories containing over a million files.

Most likely your server is either terribly slow or you've got some broken router and/or firewall that's disrupting FileZilla.