I’ve been having noticeable lag spikes, and the profiler graph shows a large purple spike. Purple is “other” category. The overview of the category during this spike shows over 75% of the processing was in “Unaccounted”. What can this be? I get about 175fps, but get random spikes! Please help! Thanks 
From the latest entry on this forum thread, it’s fairly new that Unity shows every time spent and not everything got named yet. You should try keeping up with latest Unity versions (maybe keep them parallel to your current just for checking) to see if they’ve already implemented what it means.