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Sorry to hear youâre facing problems. 
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Getting help
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- Official documentation (searchable and regularly updated)
- How to topics and FAQs
- Forum search
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Some or all of the below information will be requested if it isnât supplied; for fastest response please provide as much as you can. 
The Basics
- Nextcloud Server version (e.g., 29.x.x):
31.0.9
- Operating system and version (e.g., Ubuntu 24.04):
Debian Trixie on client, Bookworm on server
- Web server and version (e.g, Apache 2.4.25):
n/a
- Reverse proxy and version _(e.g. nginx 1.27.2)
n/a
- PHP version (e.g, 8.3):
n/a
- Is this the first time youâve seen this error? (Yes / No):
No
- When did this problem seem to first start?
n/a
- Installation method (e.g. AlO, NCP, Bare Metal/Archive, etc.)
n/a
- Are you using CloudfIare, mod_security, or similar? (Yes / No)
No
Summary of the issue you are facing:
I see a high CPU usage on the client, specifically related to my Nextcloud browser tab.
Steps to replicate it (hint: details matter!):
-
Install Nextcloud.
-
Open a browser and point to the Nextcloud server, eg. viewing the Calendar.
-
Open âtopâ or âhtopâ on the client and observe a high CPU load. Or, just listen to the fans howling.
Log entries
Nextcloud
Please provide the log entries from your Nextcloud log that are generated during the time of problem (via the Copy raw option from Administration settings->Logging screen or from your nextcloud.log located in your data directory). Feel free to use a pastebin/gist service if necessary.
n/a
Web Browser
If the problem is related to the Web interface, open your browser inspector Console and Network tabs while refreshing (reloading) and reproducing the problem. Provide any relevant output/errors here that appear.
Firefox 144
Web server / Reverse Proxy
The output of your Apache/nginx/system log in /var/log/____:
n/a
Configuration
Nextcloud
The output of occ config:list system or similar is best, but, if not possible, the contents of your config.php file from /path/to/nextcloud is fine (make sure to remove any identifiable information!):
Apps
The output of occ app:list (if possible).
Enabled:
- activity: 4.0.0
- admin_audit: 1.21.0
- app_api: 5.0.2
- appointments: 2.6.1
- bruteforcesettings: 4.0.0
- calendar: 5.5.7
- checksum: 1.2.6
- circles: 31.0.0
- cloud_federation_api: 1.14.0
- contacts: 7.3.5
- contactsinteraction: 1.12.0
- dashboard: 7.11.0
- dav: 1.33.0
- duplicatefinder: 1.7.3
- event_update_notification: 2.7.0
- federatedfilesharing: 1.21.0
- files: 2.3.1
- files_accesscontrol: 2.0.2
- files_archive: 1.2.7
- files_automatedtagging: 2.0.0
- files_downloadlimit: 4.0.0
- files_external: 1.23.0
- files_pdfviewer: 4.0.0
- files_reminders: 1.4.0
- files_sharing: 1.23.1
- files_trashbin: 1.21.0
- files_versions: 1.24.0
- files_versions_s3: 1.2.0
- group_default_quota: 0.1.11
- groupfolders: 19.1.8
- impersonate: 2.0.0
- logreader: 4.0.0
- lookup_server_connector: 1.19.0
- mail: 5.5.11
- metadata: 0.23.0
- nextcloud_announcements: 3.0.0
- notes: 4.12.3
- notifications: 4.0.0
- oauth2: 1.19.1
- password_policy: 3.0.0
- photos: 4.0.0
- privacy: 3.0.0
- profile: 1.0.0
- provisioning_api: 1.21.0
- quota_warning: 1.22.0
- recommendations: 4.0.0
- related_resources: 2.0.0
- serverinfo: 3.0.0
- settings: 1.14.0
- sharebymail: 1.21.0
- support: 3.0.0
- survey_client: 3.0.0
- systemtags: 1.21.1
- tasks: 0.17.0
- terms_of_service: 4.6.0
- text: 5.0.0
- theming: 2.6.1
- theming_customcss: 1.19.0
- twofactor_backupcodes: 1.20.0
- twofactor_totp: 13.0.0-dev.0
- updatenotification: 1.21.0
- user_status: 1.11.0
- viewer: 4.0.0
- weather_status: 1.11.0
- webhook_listeners: 1.2.0
- workflow_script: 2.0.0
- workflowengine: 2.13.0
Disabled:
- admin_notifications: 1.0.2 (installed 1.0.2)
- apporder: 0.15.0 (installed 0.15.0)
- comments: 1.21.0 (installed 1.3.0)
- deck: 1.15.3 (installed 1.15.3)
- electronicsignatures: 3.0.5 (installed 3.0.5)
- encryption: 2.19.0 (installed 2.5.0)
- external: 5.5.2 (installed 5.5.2)
- federation: 1.21.0 (installed 1.3.0)
- files_downloadactivity: 1.18.1 (installed 1.18.1)
- files_markdown: 2.4.1 (installed 2.4.1)
- files_rightclick: 1.6.0 (installed 1.6.0)
- firstrunwizard: 4.0.0 (installed 2.4.0)
- notify_push: 1.2.0 (installed 1.2.0)
- richdocuments: 8.7.6 (installed 8.7.6)
- spreed: 21.1.5 (installed 21.1.5)
- suspicious_login: 9.0.1
- talked: 0.5.0 (installed 0.5.0)
- twofactor_gateway: 0.20.0 (installed 0.20.0)
- twofactor_nextcloud_notification: 5.0.0
- user_external: 3.4.0 (installed 3.4.0)
- user_ldap: 1.22.0
- user_usage_report: 1.14.0 (installed 1.14.0)
As you can see, the process with the Nextcloud tab uses ~80% of the CPU. It sometimes uses less, but often more than that, even, and this is not a slow machine (AMD 8845HS CPU with enough memory). Cross-checking with Chromium yields that in Chromium, almost no CPU is being used. Iâve tried clearing the cache etc. on Firefox already, but to no avail. But I also canât switch to Chromium, due to other problems with that browser.