Thanks, just reproduced.

Just a question, what phone/config are you using that you have such long load times?

i9300 with archidroid experimental lollipop.
http://forum.xda-developers.com/galaxy-s3/development/rom-archidroid-v2-4-6-power-hands-t2354859
in combination with ArchiKernel.
http://forum.xda-developers.com/galaxy-s3/development/kernel-archikernel-v1-0-power-hands-t2785337.
2.0 kernel. not yet released though.

Loading all settings takes about 2.5 ~ 3 seconds.

Ah OK, the S3 is an older device. 3s sounds fine for that CPU.

yeah. I'm waiting for the nexus 5 2015 to upgrade, but for now it is a adequate device with adequate CPU.

The bug is not even that annoying now i know it. I rotated my device by accident and it crashed.

@AndreiLux

I had this bug when my RAM was overloaded with apps. Logcat is obscure, but it seems that ART itself bugs.
Rotation bug is caused by line 250 in MainActivity

    @Override
    public void onConfigurationChanged(Configuration newConfig) {
        super.onConfigurationChanged(newConfig);
        setPaddingDimensions();
        mDrawerToggle.onConfigurationChanged(newConfig); /* crashes here*/
    }

I think the problem is that when rotation happens, Fragments haven't been fully loaded, and ActionBarDrawerToggle is having some sort of bug with instant new configuration.

Maybe saving each fragment data by using Fragments setRetainInstanceState method and Activity's onSaveInstanceState and onRestoreInstanceState and reloading that data when onCreate is called after orientation change will fix the problem.

If user has some big JSON config file, then memory requirements for such Fragment data saving would be big and slow the application.

One of workarounds would be to lock orientation while all Fragments are loaded, and then unlock it via setRequestedOrientation method. I'll explore this solution when I have time.