[Webkit-unassigned] [Bug 258660] New: private class members are much, much slower then public members

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=258660

            Bug ID: 258660
           Summary: private class members are much, much slower then
                    public members
           Product: WebKit
           Version: Safari 16
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: scythes.corms_0i at icloud.com

We have noticed that using native private class members is ~95% slower than normal properties. That puts them into the same ballpark as the WeakMap-workaround that's commonly used/emitted today. 


https://jsbench.me/0gljcn4wzt/2 is a benchmark that compares

* native privates
* weakmap polyfill privates
* publics 


I have tested this with Safari 16.5.1 and latest Tech Preview. Other browsers also show inferior performance but not as dramatic.

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