element-hq / element-hq/element-ios
RRs loading freezes the UI
- Dominant language
- Swift
- Stars
- 1.8k
- Forks
- 544
- PR merge metrics
- PR metrics pending
Description
Since 1.5.2 and the lazy loading of RRs, the UI can freeze.
It is mainly visible just before the grey spinner disappears (while we are processing the /sync response) but it can happen afterwards while using the app:
Those freezes are reported by the logs
```
⚠️ [MXFileStore] Loaded read receipts of room: !xxxmatrix.org in 170ms, in main thread
⚠️ [MXFileStore] Loaded read receipts of room: !yyy:matrix.org in 62ms, in main thread
Contributor guide
Research direction
Start by tracing MXFileStore's read-receipt loading during /sync and observing the logged main-thread timings. Reproduce the freeze around spinner dismissal and during normal app use; done means read-receipt processing no longer blocks the UI.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- swift
- Domain
- mobile-dev, performance
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 35/100