I’ve been having problems with the fan getting really loud with my game. I thought the issue was that my game uses a lot of UI elements, but I thought I’d test an empty scene just incase and even though it doesn’t get as loud, the fan still gets louder just with an empty scene.
I’m using the latest version of Unity, but I don’t remember this kind of issue with 4.6.x. I’ve got a 2011 Mac Mini with the latest OSX.
Here’s a bunch of screen grabs, although I’m not sure from them you can tell if there’s any issue.
As you can see it’s taking 21% CPU (activity monitor) even with an empty scene (2d). Any ideas as to what could be causing this? or it’s just Unity 5 being more CPU intensive?
If you’re in play mode, then (depending on whether you have something limiting the framerate or not) Unity will run as fast as possible and re-draw the entire screen every frame; there’s not really technically such a thing as an “empty” scene since having a camera drawing the background is still something. My guess is that you have vsync off in Unity 5, but you had it on in Unity 4, thereby preventing Unity from attempting to run as fast as possible.
The V Sync count was set to Every V blank, on all the projects, although I did notice that the newer Unity 5 created projects were on the fantastic setting, which I then switched to “good” but unfortunately it’s not made any difference, the fan still picks up on a new project, and gets very loud for my game.
I just tested my game on my old iPad mini, and it ran at a pretty consistent 60fps with the CPU being 116%.
I think I’ve might of fixed this. I noticed I had scene lights turned off, which I thought wouldn’t cause any major issues, but I turned them on and that helped, and I set the v sync count to ever second frame and those 2 things combined seemed to have fixed the issue, now it runs and the fan doesn’t get louder at all.