[Bug]: High UI latency and COPY failures with object storage + encryption

⚠️ This issue respects the following points: ⚠️

• This is a bug, not a question or a configuration/webserver/proxy issue.
• This issue is not already reported on Github OR Nextcloud Community Forum (I've searched it).
• Nextcloud Server is up to date. See Maintenance and Release Schedule for supported versions.
• I agree to follow Nextcloud's Code of Conduct.

Bug description

Copying folders with files and subfolders when object storage as primary storage is configured is unreliable and very slow.

Installation details:

helm chart nextcloud-3.5.21
image: tag: 26.0.5-apache
db: mariadb
redis: enabled

Object Storage as primary storage: MinIO
Configured according to the following documentation: https://docs.nextcloud.com/server/13/admin_manual/configuration_files/primary_storage.html#simple-storage-service-s3

Steps to reproduce

1. Create a folder with a subfolder. The folder should be around 600 MB. Create 10 files in the folder, 10 files in the subfolder. Some of the files should be around 100 MB, others only 2 MB
2. Copy the folder via API (https://docs.nextcloud.com/server/19/developer_manual/client_apis/WebDAV/basic.html#copying-files-and-folders-rfc4918) or via Nextcloud UI.

• Depending on the overwrite flag the following responses are returned:
  • overwrite true: 423 Locked, Exception: OCA\DAV\Connector\Sabre\Exception\FileLocked, message: "xxx" is locked, existing lock on file: exclusive
  • overwrite false: 412 Precondition Failed, Exception: Sabre\DAV\Exception\PreconditionFailed, message: The destination node already exists, and the overwrite header is set to false
• In > 90% of the requests the folder is not copied completely. Some files are not copied at all, others have the ending .part and are incomplete.
• The requests take > 60s

Expected behavior

The COPY command should function reliable. What also is remarkable is the overall latency of the UI and the COPY command. The UI is nearly unusable due to latency issues (showing folders and files in the overview, copying them, ...). For example the COPY command takes > 60s. On a similar installation without object storage as primary storage the requests take < 5s and work reliable. Also the overall latency of the UI is much better.

Installation method

None

Nextcloud Server version

26

Operating system

None

PHP engine version

None

Web server

None

Database engine version

None

Is this bug present after an update or on a fresh install?

None

Are you using the Nextcloud Server Encryption module?

None

What user-backends are you using?

• Default user-backend (database)
• LDAP/ Active Directory
• SSO - SAML
• Other

Configuration report

No response

List of activated Apps

No response

Nextcloud Signing status

No response

Nextcloud Logs

No response

Additional info

No response