Sync very slow with a lot of Lists with a lot of Tasks

[0verEngineer]

Steps to reproduce

1. Have a lot of lists with a lot of tasks

Expected behavior

The sync should be fast

Actual behaviour

The sync is slow and it causes the Task.org app synced via Davx5 to be very slow and buggy, here is the Issue i created on Tasks.org: tasks/tasks#2856

Tasks app version

0.16.0

CalDAV-clients used

DAVx5

Browser

No response

Client operating system

No response

Server operating system

Docker

Web server

None

Database engine version

None

PHP engine version

None

Nextcloud version

28.0.5

Updated from an older installed version or fresh install

None

List of activated apps

No response

Nextcloud configuration

No response

Web server error log

No response

Log file

No response

Browser log

No response

Additional info

I have 21 Lists with 547 open tasks (sum of all lists) and i don't know how much closed ones, i would say 3000+ because i use this app combo since a few years now. It was always fast and i don't know when it became slow but last summer (2023) it was still fast, so it should be sometime in fall - winter 2023.

I don't know if this app is the problem and i don't know how to find out where the problem is, so any ideas how to find out are highly appreciated.

[raimund-schluessler]

Please report this in the server repository. The Tasks app is just a client itself and not involved in the sync process between the CalDAV server built into Nextcloud server and the Tasks.org client you use.

[0verEngineer]

@raimund-schluessler Oh sorry i did not know this, do you mean the nextcloud server?

[raimund-schluessler]

Yes, here please https://github.com/nextcloud/server