Hiccups even when loading scene async

Hey,

In our game, we load new popup windows on top of the current scene (additive) and using LoadLevelAsync.
Here is a long frame that i captured (from the profiler, profiling the editor):



When using load async, why is this taking so long, and on the main scripting thread?

In the screenshot above you can see the main thread is running these methods:

• Loading.UpdatePreloading
• Application.Integrate assets in background (on the main thread?)
• Application.LoadLevelAsync

I know that the editor's behaviour is different from running on the target device, but we cannot get any useful information without using "deep profiling", which isn't there on the device.