[Webkit-unassigned] [Bug 190552] New: UI / DOM blocks audio thread, causing crackles

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=190552

            Bug ID: 190552
           Summary: UI / DOM blocks audio thread, causing crackles
           Product: WebKit
           Version: Other
          Hardware: iPhone / iPad
                OS: iOS 12
            Status: NEW
          Severity: Major
          Priority: P2
         Component: Web Audio
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ae at seven.systems

We're developing a WebAudio-based DAW running in a WKWebView. This works amazingly well and we're thrilled how far the Web Audio API has come.

However, when the engine is under high load (roundabout 500 nodes for the entire loaded project), interacting with the DOM (scrolling, adding / removing elements, etc.) in any way causes severe buffer underruns, even at 1024 frames buffer size (set by starting another app that sets that buffer size and records in the background).

Shouldn't the audio thread run with high priority and not be blocked by the UI / DOM thread?

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