[Webkit-unassigned] [Bug 217290] New: WASM performance slowdown starting from Safari 14

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=217290

            Bug ID: 217290
           Summary: WASM performance slowdown starting from Safari 14
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: caiiiycuk at gmail.com

Created attachment 410455

  --> https://bugs.webkit.org/attachment.cgi?id=410455&action=review

Safari 13.1.1

Hi. I am the author of the js-dos project (dosbox in js). After updating to Safari 14 I see a dramatic performance loss in js-dos dhry2 test. It reproduced on all devices: iphone 6, iphone 7, iphone 8, iphone x, macos catalina. All Safari starting from 14 affected (I tested 14.0, 14.0.1 and Technology Preview).

The test is a variation of dhry 2 test for dos. It runs inside js-dosbox and reports operation count. Time is measured with Date.now(). So it only does math operations and estimate time. 

You can run this test using link. 
https://dos.zone/en/play/https%3A%2F%2Fdoszone-uploads.s3.dualstack.eu-central-1.amazonaws.com%2Foriginal%2F2X%2Fb%2Fb4b5275904d86a4ab8a20917b2b7e34f0df47bf7.jsdos

My results are in attached screenshots.

Results from (MacBook Pro (13-inch, 2017, Two Thunderbolt 3 ports, Catalina 10.15.17):
Safari 13.1.1 - (640_000, VAX: 48)
Safari 14.0.0 - (80_000, VAX: 5.5)
Safari 14.0.1 - (80_000, VAX: 5.5)
Safari TP     - (80_000, VAX: 5.9)
Firefox       - (640_000, VAX: 36.9)

--
I also tried to test in recent builds of webkit (267874, 267919, 267940). But, always have this error:
MacBook-Pro-Alexander:~ caiiiycuk$ /Users/caiiiycuk/Downloads/267940/run-webkit-archive ; exit;
Setting DYLD FRAMEWORK and LIBRARY paths to /Users/caiiiycuk/Downloads/267940/Release
2020-10-04 15:21:50.936 SafariForWebKitDevelopment[4346:301066] -[BrowserWKView _setInspectorDelegate:]: unrecognized selector sent to instance 0x7fef794c9c30
2020-10-04 15:21:50.936 SafariForWebKitDevelopment[4346:301066] -[BrowserWKView _setInspectorDelegate:]: unrecognized selector sent to instance 0x7fef794c9c30
2020-10-04 15:21:50.947 SafariForWebKitDevelopment[4346:301066] .sdef warning for argument 'FileType' of command 'save' in suite 'Standard Suite': 'saveable file format' is not a valid type name.
2020-10-04 15:21:50.995 SafariForWebKitDevelopment[4346:301134] +[NSXPCSharedListener endpointForReply:withListenerName:]: an error occurred while attempting to obtain endpoint for listener 'SandboxBroker': Connection invalid
2020-10-04 15:21:51.083 com.apple.WebKit.WebContent.Development[4348:301125] Error loading /Library/Apple/System/Library/StagedFrameworks/Safari/Safari.framework/Safari:  dlopen(/Library/Apple/System/Library/StagedFrameworks/Safari/Safari.framework/Safari, 265): Symbol not found: _OBJC_CLASS_$_WBSContentBlockerStatisticsSQLiteStore
  Referenced from: /Library/Apple/System/Library/StagedFrameworks/Safari/SafariSharedUI.framework/Versions/A/SafariSharedUI
  Expected in: /System/Library/PrivateFrameworks/SafariShared.framework/Versions/A/SafariShared
 in /Library/Apple/System/Library/StagedFrameworks/Safari/SafariSharedUI.framework/Versions/A/SafariSharedUI
InjectedBundle::load failed - Could not load the executable from the bundle.
2020-10-04 15:22:01.457 SafariForWebKitDevelopment[4346:301066] -[BrowserWKView _setInspectorDelegate:]: unrecognized selector sent to instance 0x7fef7d529cc0

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