Bug 196764 - Date.setDate is too slow in WKWebView
Summary: Date.setDate is too slow in WKWebView
Status: RESOLVED DUPLICATE of bug 218348
Alias: None
Product: WebKit
Classification: Unclassified
Component: JavaScriptCore (show other bugs)
Version: WebKit Nightly Build
Hardware: Unspecified Unspecified
: P2 Normal
Assignee: Nobody
URL:
Keywords: InRadar
Depends on:
Blocks:
 
Reported: 2019-04-10 00:20 PDT by chenfeng
Modified: 2021-02-01 02:34 PST (History)
6 users (show)

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Description chenfeng 2019-04-10 00:20:38 PDT 
var sTime = Date.now();
var curTime = new Date();

for (var i = 0; i < 10000; i++) {
curTime.setDate(i);
}
console.log(Date.now() - sTime)



The execution time of the above code in different browsers:
Wkwebview: 16000ms
Safari: 120ms
Chrome: 3ms
Comment 1 Radar WebKit Bug Importer 2019-04-12 10:13:47 PDT 
<rdar://problem/49854826>
Comment 2 Yusuke Suzuki 2021-02-01 02:34:16 PST 
Now, Safari's perf is on per to Chrome.
Note: previously, JSC uses localtime_r. But this is super slow. Now we use ICU instead.

*** This bug has been marked as a duplicate of bug 218348 ***