mapbox / mapbox/mapbox-maps-ios
Performance Issue with drawInMTKView:
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- Dominant language
- Swift
- Stars
- 601
- Forks
- 196
- PR merge metrics
- No merged PRs in 30d
Description
Environment
- Xcode version: 13.4.1
- iOS version: 15.6 & 16
- Devices affected: All
- Maps SDK Version: 10.6
Observed behavior and steps to reproduce
On the initial load (without caching), flying a camera with a fixed duration will cause frame drops. This is sometimes also apparent when panning. Below is the code I'm using:
let cameraOptions = CameraOptions(center: .init(latitude: event.lat, longitude: event.long), zoom: 10)
self.mapView.camera.fly(to: cameraOptions, duration: 0.9)
Expected behavior
Consistent 60fps performance on up-to date hardware
Notes / preliminary analysis
It seems some drawing code is spending a significant time on the main thread causing frame drops. The style URI we're using: mapbox://styles/touchgrove/cl70b4lij000f14pndegvdba9
Additional links and references
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Reproduce the frame drops with camera.fly(to:duration:) on an uncached map using the linked style URI, then inspect drawInMTKView and the reported main-thread drawing work with profiling tools. Done means identifying and addressing the performance issue so camera flights maintain consistent 60fps on affected hardware.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- ios, swift
- Domain
- mobile-dev, performance
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100