If you launch the app from a push notif, you can be shown stale timeline with no spinner

[ara4n]

After a few seconds messages start to be shown (still no spinner), and then after a few more seconds it catches up entirely - then briefly shows the grey spinner. This on 1.4.3 TF

[manuroe]

There is an issue in the state of the MXSession.

What is happening behind the scene is that we start replaying /sync responses we got and cached when fetching data to display push notifications. I am surprised that it is so slow but I can observe it.

Then, we do an incremental sync with the server. This is when the grey spinner appears.

[manuroe]

This /sync responses replay makes the UX even weirder on room lists when you got invites and join rooms while the ios app was in the background.

[manuroe]

We should probably merge all cached sync responses into one.
We have several of them because we have only 12MB of RAM to manage them in the notification extension. We have more than 1GB in the app.

It will kill the replay dance.
It will solve the room invites that briefly appears (if the sync response merging algo is smart enough).
It will reduce the number of data. There is probably gaps in the updated timelines. This should help on performance.
The SDK emits data refresh events on every /sync response handling completion. Having a single response will produce less refreshs and less computation.

[ara4n]

As a quick workaround, can we show the catchup spinner until it's actually caught up? The worst thing here is that it's showing you stale content with no UI to warn you that it's stale.

[manuroe]

The catchup spinner will be fixed with the MXSession state fix.

I have the feeling that merging all cached sync responses will improve the performance a lot. I cannot understand why the app stays so long in a stale state while everything is available locally.
It will also help to better handle the MXSession state.

[ara4n]

i'm getting this more and more, and it's taking so long to catch up it looks as if messages are missing entirely - with no spinner to tell you that you're looking at known stale content.