"SceneCulling" large CPU latency during multiple UI element position update

I am having an issue that's causing significant latency spikes in my CPU usage and I'm not sure why.

What caused the issue:
I have many (20-30) canvases present on the screen at once that update their panel child anchor position every Update cycle (shouldn't be very CPU expensive). These canvases each have a panel child with a text and image child. The idea is to have a little sprite image that follows the gameobject around on the screen with some information. So far so good.

However upon implementing this I am getting huge CPU usage due to "SceneCulling" in the profiler. I am not sure what this is or how it relates to my UI elements. I have tried with my main camera occlusion culling both on and off but still laggy.

Below is a snapshot of my profiler.

Any idea what is causing the issue here?

 

It seems you profiled the game running in the editor. I recommend to repeat the test and profile a build on the target platform instead. The editor often has significantly different performance and memory characteristics than a build and perhaps these spikes only exist in the editor.

Here is also an interesting talk why it's important to profile a build rather than the game running in the editor...

Spoiler

 

Thanks Peter, I did a build of the game and can confirm that the latency issues are no longer present. Might have just been the editor.