Support intro
Sorry to hear you’re facing problems 
help.nextcloud.com is for home/non-enterprise users. If you’re running a business, paid support can be accessed via portal.nextcloud.com where we can ensure your business keeps running smoothly.
In order to help you as quickly as possible, before clicking Create Topic please provide as much of the below as you can. Feel free to use a pastebin service for logs, otherwise either indent short log examples with four spaces:
example
Or for longer, use three backticks above and below the code snippet:
longer
example
here
Some or all of the below information will be requested if it isn’t supplied; for fastest response please provide as much as you can 
Nextcloud version (eg, 20.0.5): 21.01 (snap)
Operating system and version (eg, Ubuntu 20.04): Centos8
Apache or nginx version (eg, Apache 2.4.25): snap std
PHP version (eg, 7.4): snap std
The issue you are facing:
I like to connect a external storage via ftp and share it with a link path to some people.
It is loading very very slow (e.g. 5 to 7 mins to show the dir) even it is in the same LAN with GBit Ethernet.
Is this the first time you’ve seen this error? (Y/N): Yes, I just set it up today like this (external storgae)
Steps to replicate it:
- connect a ftp ext storage and share it with a link
The output of your Nextcloud log in Admin > Logging:
PASTE HERE
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
PASTE HERE
The output of your Apache/nginx/system log in /var/log/____:
PASTE HERE