Syncing/refreshing is extremly slow

This issue respects the following points:

• I have read the FAQ
• I have searched for existing issues
• The issue affects the Notes Android app, neither the Notes server app nor the Nextcloud Android app.

Describe the bug

Refreshing/Syncing the Notes app takes way too long (~10 seconds), even if nothing has changed.

I think this means all remote notes are downloaded on every request, at least thats what I got from quickly glancing over the relevant code.

As per the Nextcloud Notes Api docs:
https://github.com/nextcloud/notes/blob/main/docs/api/v1.md#get-all-notes-get-notes

PruneBefore should be used to only download notes that have been remotely changed since the last update:

 pruneBefore 	integer, optional 	All notes without change before of this Unix timestamp are purged from the response, i.e. only the attribute id is included. You should use the Unix timestamp value from the last request's HTTP response header Last-Modified in order to reduce transferred data size.

(or alternatively the ETAG contained in the response)

This is still an issue even if I'm wrong about the cause, it shouldn't take more than a second (accounting for network latency).

Expected behavior

No response

Notes Android version

3.5

Notes server version

4.11

Nextcloud Android version

3.30.6

Nextcloud version

30.0.4

Device

Samsung Galaxy Z Flip 5

Android Version

14

App Store

• Google Play Store
• F-Droid
• Huawei App Gallery

Stacktrace

No response

Start with the Notes API documentation linked in the issue, then trace the Android app's refresh and sync implementation that requests remote notes. Measure a refresh with no remote changes and determine whether the request uses the documented change markers. Done means unchanged notes are not fully transferred and refresh time is reduced to the expected range.