Lean Zulip is very slow

Stream: Zulip meta

[Geoffrey Irving]

On the iPhone app, when I go to a channel Zulip often takes several seconds to load, even if all I want to do is jump to the end.

I was curious if that is normal, and found this page on Zulip’s docs where they talk about timings measured in 10s of milliseconds for most queries: https://zulip.readthedocs.io/en/latest/subsystems/performance.html

Anyone know why Lean’s instance is slow, or if the app is always slow?

[Jireh Loreaux]

Do you know that the Flutter Beta version of the app is now publicly available? It's quite snappy.

[Marc Huisinga]

Do you have lots of unread messages? I vaguely remember that this used to slow down the app significantly.

[Geoffrey Irving]

Jireh Loreaux said:

Do you know that the Flutter Beta version of the app is now publicly available? It's quite snappy.

Wow, that seems to entirely fix the speed issues! Thank you!

[Geoffrey Irving]

Marc Huisinga said:

Do you have lots of unread messages? I vaguely remember that this used to slow down the app significantly.

I usually mute nearly all threads, which means everything in their is unread. It’s plausible that the old app is deciding to pay the cost of loading all of those. But the new app seems free of speed problems.

[Shreyas Srinivas]

On the iOS App Store I don’t see the flutter beta app

[Jireh Loreaux]

Note that the flutter version doesn't yet have feature parity with the old app.

[Shreyas Srinivas]

(Although to be fair, the normal app is actually much better on iOS than android)

[Geoffrey Irving]

https://blog.zulip.com/2024/12/12/new-flutter-mobile-app-beta/

[Jason Rute]

My understanding is that on every load they read all messages up to your oldest unread message. :scream: So for me it is incredibly slow.

[Jason Rute]

The new app doesn’t really fix this issue.

[Geoffrey Irving]

Aha, possibly what sped things up was just the fresh install, which is temporary.

[Notification Bot]

This topic was moved here from #general > Lean Zulip is very slow by Floris van Doorn.

[Alex Vandiver]

Jason Rute said:

My understanding is that on every load they read all messages up to your oldest unread message. :scream: So for me it is incredibly slow.

This is no longer the case on web, since last summer. I expect that the Flutter app is also using a better algorithm, and that the old mobile app has not been changed.

[Alex Vandiver]

If you're experiencing slowness on the webapp or the new Flutter app, we'd like to hear more about it.

[Jason Rute]

@Alex Vandiver if I click on an Zulip iPhone notification, it takes 24 seconds for the flutter Zulip app to load the leanprover Zulip. That seems like a long time.

[Jason Rute]

I have a lot of unread messages going back years.

[Alex Vandiver]

That does -- and that's a helpful report. I'll pass it along to the Flutter devs.

[Jason Rute]

I got the flutter app last year when you told me about it @Alex Vandiver and it still says “beta”. Is that the right version?

[Alex Vandiver]

It's still in beta, yes. You can check the app's version by going to the hamburger menu in the bottom right and clicking "About Zulip." 0.0.25 is the latest.