Hello and thanks for reading this,
My first impression was very good, I installed linuxserver/nextcloud through docker on unraid (Installed with ‘Community Applications’)
Problem:
After syncing data for 5 minutes it became very slow. uploading speed of 0,5-2 MBps (through windows nextcloud application and uploading via browser) Sometimes I get a 504 Gateway Time-out (nginx/1.12.2)
What I have tried so far:
Reinstalled nextcloud multiple times
SQLite --> MariaDB (installed linuxserver/mariadb) After this installation it started fast again
(there was a smile on my face but only lasted for ~5 minutes… then it become horrible slow again.)
Added in config.php:
‘auth.bruteforce.protection.enabled’ => false,
Software versions:
Unraid: 6.3.5
linuxserver/nextcloud: (up-to-date, not sure where to find the version)
Installation settings:
Repository: linuxserver/nextcloud
Docker Hub URL: https://hub.docker.com/r/linuxserver/nextcloud
WebUI: https://[IP]:[PORT:443]/
Extra Parameters:
Network Type: Bridge
Privileged: OFF
Host Port 1(PORT): 443
Host Path 2(/DATA): /mnt/user/Cloud/
Key 1: (PUID: 99
Key 2: (PGID): 100
AppData Config Path: /mnt/user/appdata/nextcloud
Not sure where to look, I am very new to unraid, docker and Linux.
Maybe it is a config file somewhere? Also Unraid, shares (80MBps) and plex (also docker) etc are working great.
Hopefully someone can point me in the right direction. 
PS: please move topic if this is the wrong place for it, or tell me where to post it, thanks.