Heading tracking mode idles at 50%+ CPU

[friedbunny]

Platform: iOS 10
Mapbox SDK version: iOS v3.6.0-3.6.2

Steps to trigger behavior

1. Enable heading tracking mode.
2. Observe CPU idling at 50-65%, when idle should be 0-1%.

This bisects back to #7716 and 3b109c8.

/cc @frederoni

[mdakram]

Pretty high CPU usage in case heading tracking on Android too.

[tobrun]

@mdakram is this with using TrackingSettings/MyLocationView setup on Android? Have you tried the LocationLayer plugin that will deprecate the former?

[friedbunny]

@mdakram the issue here appears to be specific to iOS layout code (that’s platform specific), so I would expect any Android performance issues to be unrelated.

[mdakram]

@friedbunny May be.

Yes @tobrun i tried LocationLayer too(which is not good for just showing user's location, when user is moving location dot seems to jump from one location to another, unlike LocationView, which is smooth), but it seems CPU usage is due to tile rendering.

[friedbunny]

Fixed in #9845, will be in v3.6.3.

@mdakram please go ahead and open a new issue for Android, as this particular issue did turn out to be specific to iOS.