iOS stuck at 50 fps, while CPU and GPU utilization is only 30%

Hey guys, after heavy optimizations I've managed to get my game to a decent framerate on iPhone 6 - I am getting 50 frames per second.

What's weird is while monitoring the compiled Unity project from xCode, I can see that device is only using 30% of its horsepower.

My character stands in one spot in a completely static environment, and every once in a while the framerate climbs up to 60 fps, (and is shown in xCode), then quickly goes down to 46-50 fps.

Have a look at what the xCode is saying:

CPU:


GPU:



and here is energy: (maybe something to do with thermal? ..hmm, but utilization is still low on GPU and CPU, there should be no heat throttling yet!)

Spoiler: intepretations for the 'energy' image

As you can see, energy graph shows only purple and green bars - GPU and CPU. So these two are the only ones we need to read in the "interpretations" spoiler.

Is there a setting in Unity to squeeze-out these extra 10 frames? Device Utilization allows for that

 

bump

 

This is also happening to me hmm.

 

I am not too sure, but this might be related to garbage collection.

We can now switch to Unity 2019.1, because it finally has the Incremental Garbage Collector, that doesn't cause FPS spikes at equal timeframes, but collects across several frames. This might help, but I haven't yet checked if that indeed was the cause for iOS.