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, 12.0.2): 15.0.6
Operating system and version (eg, Ubuntu 17.04): Fedora 29
Apache or nginx version (eg, Apache 2.4.25): httpd-2.4.38-2.fc29.x86_64
PHP version (eg, 7.1): PHP 7.2.16
The issue you are facing:
Using the web gui, displaying the contents of a shared folder is very slow or may not complete at all for all users except the original folder owner. This is particularly for folders with many files, e.g. 267 files totalling 230Mb takes ~60 secs to display.
No obvious load is seen on the server. memcache has been configured and HTTP2 enabled.
Is this the first time you’ve seen this error? (Y/N): Yes, but this may be due to pattern of increased usage
Steps to replicate it:
- Share a folder with many files to one or more users
- Browse shared folder as other user results in slow/no render of contents
The output of your Nextcloud log in Admin > Logging:
No errors seen
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'instanceid' => 'xxxx',
'passwordsalt' => 'xxxxxxxxxxxxxxxxxx',
'trusted_domains' =>
array (
0 => 'example.com',
),
'datadirectory' => '/export/data/owncloud/data',
'dbtype' => 'mysql',
'version' => '15.0.6.1',
'dbname' => 'owncloud',
'dbhost' => 'localhost',
'dbtableprefix' => 'oc_',
'dbuser' => 'xxxxxxx',
'dbpassword' => 'xxxxxxx',
'defaultapp' => 'calendar,files',
'forcessl' => true,
'theme' => '',
'installed' => true,
'maintenance' => false,
'overwritewebroot' => '/owncloud',
'overwrite.cli.url' => '/owncloud',
'mail_from_address' => 'nextcloud',
'mail_smtpmode' => 'smtp',
'mail_smtpdebug' => false,
'mail_domain' => 'example.com',
'secret' => 'xxxx',
'memcache.local' => '\OC\Memcache\APCu',
'memcache.distributed' => '\OC\Memcache\Redis',
'memcache.locking' => '\OC\Memcache\Redis',
'redis' => array(
'host' => '/var/run/redis/redis.sock',
'port' => 0,
'timeout' => 0.0,
),
'asset-pipeline.enabled' => false,
'mail_smtphost' => 'x.x.x.x',
'mail_smtpport' => '25',
'loglevel' => 2,
'trashbin_retention_obligation' => 'auto',
'log_rotate_size' => 10485760,
'appstore.experimental.enabled' => false,
'updater.release.channel' => 'stable',
'mysql.utf8mb4' => true,
);
The output of your Apache/nginx/system log in /var/log/____:
No errors seen