Scroll Rect is TOOO SLOW

Simply switching from Mask to RectMask2d took me from 50fps idle, and ~15fps scrolling to 590fps idle and 70FPS scrolling.

Using TextMeshPro for all text elements.

Rapidly scrolling large lists is still a significant issue on mobile though, and causes significant stuttering even in high-end phones. Nothing runs on `Update()` either, the entire list is static.

If I have lists of 100+ items, scrolling is back down to 10-20fps or worse.

 

There are several solutions that work with object pooling instead of populating the entire list. You should look into one of those if you have a huge list of items.

 

I just had a similar issue.
My problem got fixed by disabling the pixel perfect option in the root canvas.
I accidently activated it and suddenly my performance dropped like crazy.
Maybe this can still help someone.

https://docs.unity3d.com/ScriptReference/Canvas-pixelPerfect.html

 

I have a project which is very similar, many scrollviews in one big scrollview, in unity it runs at 650fps. But my client says on his mac in WebGL its around 2fps (LOL). Webgl on pc is still lightning fast. I will try all the things mentioned here, but if anyone at unity wants the project to test I can send. The reason I say this is because it seems WebGL runs VERY VERY badly on Macs quite often (nearly always the mac book pro? might be a coincidence but I hear it has a poor gpu). Funny thing is people report no performance issues on my fully fledged online webgl game, so seems to be UI.

 

That was exactly my case, thanks for sharing