Bug Disabled gameobjects are eating performance of PlayerUpdateCanvases

I have ~20 menus loaded as child-canvases under a main canvas.
If I disable the gameobject of each one of them, performance doesn't change.
If I delete them, performance falls down to almost nothing.

I can literally have a canvas with ONLY disabled child-objects and it's taking 2-3ms?
After I delete the 19 disabled menus I get -> 0.05ms?

Is this just how it's designed?
How do I work around this..

I want to avoid loading/unloading menus from memory.

- Screen-space camera
- Pixel perfect -> OFF
- 2020.3.42f1

Very good computer, so the 2 ms seems small.. but it's not. Camera render is 2.5ms, game logic <1ms

 

nvm, i'm an idiot

edit: nvm, i'm not an idiot, i got receipts

 

This is when I have a canvas with only disabled objects underneath.

1ms





This is after deleting everything, and adding a small cube-image in the center.

0.1ms

 

this cannot be how it should work, something is still being processed in there, right?

 

after further investigation, it seems not related to the amount of child-canvas, removing all canvases doesn't change anything.

maybe the amount of objects?..

 

it ONLY happens when I move my character, or while moving my aim (FPS Shooter), if not moving, and just standing still looking at a wall, there's no increase

 

what's happening in here.. deep profiling on

 

Assuming the canvases are NOT childed to a dynamic object... Set the canvas and all its children to static, see what happens.

 

no noticable difference :/

 

why there is a main canvas ? A simple transform parenting should be enough for organizing. Could you remove it and try again? Probably all canvases redraw because of parent canvas. https://unity.com/how-to/unity-ui-optimization-tips

 

> why there is a main canvas
need to have for canvas-scaler compoentnt

> Could you remove it and try again? Probably all canvases redraw because of parent canvas
if you see my picture there's only ONE canvas, the parent canvas, issue remains

and + the issue is not the canvas-scaler, i've tried with disabled/removed scaler too

 

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