Huge Physics Spikes (In empty scene and populated scene)

Since I removed NGUI from my project, I don't have any more of those spikes in Physics.Processing.

I had the same issue: First I noticed heavy stuttering randomly in simple scenes. When I checked the profiler it showed spikes at random in Physics.Processing. They needed about 33ms to 60ms (30 to 15 FPS). Even in an empty scene they appeared. Even in a new project they appeared. Only when I restarted my PC, opened Unity and created a new project they were gone. However, when I opened my project and a scene, the spikes were back. Again I restarted my PC. The only tools I used, which don't ship with Unity, were NGUI and iTween. So I created a new project and imported first iTween and then NGUI. No spikes. But after I added NGUI objects (just basics and a button) the spikes showed up. As soon as they appeared once, they also showed up in empty scenes. Now I re-created my user interface with Unity UI (works like a charm by the way) and the spikes are gone.

In conclusion: I think there is something in my NGUI version (version 2.7.0) that causes those spikes in Physics.Processing as soon as it is loaded and until it is released somehow.

I was seeing Huge Physics.Processing spikes in Unity both an empty scene and the scene for my game. I counted 3 spikes in 1 minute on the empty scene and 10 spikes in one minute on my game.

I restarted my computer and ran unity without a bunch of other programs running on my computer. It didn't solve the problem outright, but it does seem like there are fewer spikes. There was 1 Huge Physics.Processing spike in 1 minute on the empty scene and 0 Huge Physics.Processing spikes in 1 minute on my game. These spikes seem really random though and I have no idea what causes them.

I had the exact same problem.. There were physics Spikes in my Game Scene aswell in an empty scene.

FIXED by Updating to version Unity 5.4.2f2 (64-bit)

I'm suddenly also having this issue, in Unity Plus 5.4.1f1... Before these spikes, my 15 GIG large project was ruing at 70 FPS to 200 FPS (never lower). Now, i'm having these "CPU 98% overhead" (Profiler) spikes, for no apparent reason... (even simple update is now needed to shoot them, by random, and stall my game play in Editor, every now and than, for a second or two each time... My goodness... what other problems we are running into, with every new Unity Update ? (every update - something else screws up, on another corner). This is not worth (any) of my paying unity Plus money, not really, i must say it, to be honest ... (on any of computers of me or my staff, there is now this gustly issue ...).