[Webkit-unassigned] [Bug 238943] New: Safari crashing hard when scaling SVGs and Canvas

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=238943

            Bug ID: 238943
           Summary: Safari crashing hard when scaling SVGs and Canvas
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Mac (Apple Silicon)
                OS: macOS 12
            Status: NEW
          Severity: Blocker
          Priority: P2
         Component: Compositing
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: isaac at felt.com
                CC: simon.fraser at apple.com

Created attachment 456938

  --> https://bugs.webkit.org/attachment.cgi?id=456938&action=review

Flash thing 1 at 45s mark

Hi, everyone.
At Felt we are creating a tool to build maps. This involves having a background with tiled canvases where the basemap is rendered and some SVGs on top of them.

We've been having some issues with the rendering on Safari itself:
- We weren't able to render large paths: https://bugs.webkit.org/show_bug.cgi?id=231157 This was solved in STP 139
- Problems with the Garbage collection of canvases: https://bugs.webkit.org/show_bug.cgi?id=195325 Which we solved with the solution exposed in the first post

What we are finding now is that in STP 142, the whole browser starts doing really weird flashes when we zoom in/out in a map with lots of elements.
I can provide a map to reproduce what we are seeing: https://felt.com/map/Untitled-Map-aMPeGQj2ThqwJf43XpyQCB
Zooming in/out quickly will get to a point were the whole browser screen. including the navbar starts flashing like crazy.
I have also recorded a video, which can be accessed here https://drive.google.com/file/d/1WheqbvMu1nriGjvLijHHxmEFp44cbQ4l/view?usp=sharing
Looking at that video, around 45 seconds in, you'll see the browser starts lagging even though I'm constantly scrolling up/down with the trackpad as I was doing before. 
Later, at the 1 minute mark, you'll see the first occurrence of that flashing thing and later, at 1:16 you'll see an even worse flashing thing.

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