From some moment I noticed that my game became slower than it was. I started to delete objects from scene to see where is the bottleneck, but even with empty scene i get only avg 45 fps on ipod 2g. It was normally 60 fps earlier in the same situation. It means that this problem is connected with scene/project settings or so, but I almost haven’t changed them.
The other question is that: do disabled objects affect performance? I have 2 scenes and when I disable everything on both of them they still have different frame rate.
So many years later and this comment just saved me from ripping my hair apart! Turned out I had V-Sync set to “Total FPS Obliteration of DOOM”. Edit->Project settings->Quality->Other->V-Sync Count. Turned it off and went from ~30 fps to ~470 fps.