Hi,
I have similar speed issues.
My environment:
- Client Chromium (120.0.6099.216) Ubuntu 22.04, i7, 32 GB RAM, SSD
- Server HW is Intel(R) Core™ i7-3610QM CPU @ 2.30GHz, 16 GB RAM, 8TB SSD.
- Using Nextcloud 27.1.5 with NGINX+FPM+REDIS+MARIADB.
- Only default apps installed, (fol a list please see below)
Initially I thought it is server side issue and I am still not 100% sure it is not, but profiler in Chrome shows this:

Could it be something wrong in the frontend?
occ app:list
Enabled:
- activity: 2.19.0
- admin_audit: 1.17.0
- bruteforcesettings: 2.7.0
- cloud_federation_api: 1.10.0
- comments: 1.17.0
- contactsinteraction: 1.8.0
- dashboard: 7.7.0
- dav: 1.27.0
- externalportal: 1.2.0
- federatedfilesharing: 1.17.0
- files: 1.22.0
- files_external: 1.19.0
- files_markdown: 2.4.1
- files_reminders: 1.0.0
- files_rightclick: 1.6.0
- files_sharing: 1.19.0
- files_trashbin: 1.17.0
- files_versions: 1.20.0
- firstrunwizard: 2.16.0
- imageconverter: 1.3.5
- logreader: 2.12.0
- lookup_server_connector: 1.15.0
- memories: 6.2.2
- notifications: 2.15.0
- oauth2: 1.15.1
- password_policy: 1.17.0
- photos: 2.3.0
- previewgenerator: 5.4.0
- privacy: 1.11.0
- provisioning_api: 1.17.0
- recommendations: 1.6.0
- related_resources: 1.2.0
- serverinfo: 1.17.0
- settings: 1.9.0
- sharebymail: 1.17.0
- suspicious_login: 5.0.0
- systemtags: 1.17.0
- text: 3.8.0
- theming: 2.2.0
- twofactor_backupcodes: 1.16.0
- twofactor_totp: 9.0.0
- updatenotification: 1.17.0
- user_status: 1.7.0
- viewer: 2.1.0
- weather_status: 1.7.0
- workflowengine: 2.9.0
Disabled:- circles: 27.0.1 (installed 27.0.1)
- encryption: 2.15.0
- federation: 1.17.0 (installed 1.17.0)
- files_pdfviewer: 2.8.0 (installed 2.8.0)
- nextcloud_announcements: 1.16.0 (installed 1.16.0)
- notes: 4.9.2 (installed 4.9.2)
- support: 1.10.0 (installed 1.10.0)
- survey_client: 1.15.0 (installed 1.15.0)
- user_ldap: 1.17.0
