Nextcloud slow or stuck in sharing dialog for large text files

[scf-wgross]

Steps to reproduce

1. Upload large text file (100MB, extension txt). Preview ok.
2. Click on sharing link of this file
3. Sharing dialog hangs. Sometimes a warning dialog pops up due to java script taking too long.

Expected behaviour

Show immediately the first few lines.

Actual behaviour

It takes a very long time to show the expected behaviour. Most people will try to abort.

Server configuration

Operating system: OpenLeap 42.2

Web server: Apache 2.4

Database: MariaDB 10.0.29-18.1

PHP version: PHP 7.0.7-14.3.1

Nextcloud version: (see Nextcloud admin page) 11.0.2

Updated from an older Nextcloud/ownCloud or fresh install: Fresh install

Where did you install Nextcloud from: Opensuse repository

Signing status:

No errors have been found.

Login as admin user into your Nextcloud and access 
http://example.com/index.php/settings/integrity/failed 
paste the results here.

List of activated apps:

Enabled: - activity: 2.4.1 - comments: 1.1.0 - dav: 1.1.1 - external: true - federatedfilesharing: 1.1.1 - federation: 1.1.1 - files: 1.6.1 - files_pdfviewer: 1.0.1 - files_sharing: 1.1.1 - files_texteditor: 2.2 - files_trashbin: 1.1.0 - files_versions: 1.4.0 - files_videoplayer: 1.0.0 - firstrunwizard: 2.0 - gallery: 16.0.0 - logreader: 2.0.0 - lookup_server_connector: 1.0.0 - nextcloud_announcements: 1.0 - notifications: 1.0.1 - password_policy: 1.1.0 - provisioning_api: 1.1.0 - serverinfo: 1.1.1 - sharebymail: 1.0.1 - survey_client: 0.1.5 - systemtags: 1.1.3 - theming: 1.1.1 - twofactor_backupcodes: 1.0.0 - updatenotification: 1.1.1 - workflowengine: 1.1.1 Disabled: - admin_audit - encryption - files_accesscontrol - files_automatedtagging - files_external - files_retention - templateeditor - user_external - user_ldap - user_saml

If you have access to your command line run e.g.:
sudo -u www-data php occ app:list
from within your Nextcloud installation folder

Nextcloud configuration:

{ "system": { "instanceid": "***REMOVED SENSITIVE VALUE***", "passwordsalt": "***REMOVED SENSITIVE VALUE***", "secret": "***REMOVED SENSITIVE VALUE***", "trusted_domains": [ "cloud.exchi.uni-heidelberg.de" ], "datadirectory": "\/home\/nextcloud_data", "overwrite.cli.url": "***REMOVED SENSITIVE VALUE***", "dbtype": "mysql", "version": "11.0.2.7", "dbname": "ncexchi", "dbhost": "localhost", "dbport": "", "dbtableprefix": "oc_", "dbuser": "***REMOVED SENSITIVE VALUE***", "dbpassword": "***REMOVED SENSITIVE VALUE***", "logtimezone": "UTC", "installed": true, "mail_smtpmode": "smtp", "mail_from_address": "cloudinfo", "mail_domain": "***REMOVED SENSITIVE VALUE***", "mail_smtphost": "***REMOVED SENSITIVE VALUE***", "mail_smtpport": "25" } }

If you have access to your command line run e.g.:
sudo -u www-data php occ config:list system
from within your Nextcloud installation folder

or 

Insert your config.php content here. 
Make sure to remove all sensitive content such as passwords. (e.g. database password, passwordsalt, secret, smtp password, …)

Are you using external storage, if yes which one: no

Are you using encryption: no

Are you using an external user-backend, if yes which one: no

Client configuration

Browser: Firefox 53.0

Operating system: Windows 7 (all updates)

Logs

No relevant log entries from apache, nextcloud, mariadb, php, firefox

[MorrisJobke]

Fixed by #5954