Bug 298226
| Summary: | [iOS 18.6 Regression] Page load takes ~24s in Safari/WebView due to WebKit rendering/JS execution slowdown | ||
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| Product: | WebKit | Reporter: | Deepak <deepak.srivastava> |
| Component: | New Bugs | Assignee: | Nobody <webkit-unassigned> |
| Status: | RESOLVED DUPLICATE | ||
| Severity: | Critical | ||
| Priority: | P1 | ||
| Version: | WebKit Nightly Build | ||
| Hardware: | iPhone / iPad | ||
| OS: | Other | ||
Deepak
Product: WebKit (Safari / iOS) Version: iOS 18.6 (WebKit 618.x – Hardware: iPhone 14 / iOS 18.6 (also reproducible on other iPhones)
Steps to Reproduce Open Safari on iOS 18.6 (or any WKWebView in an app).
Navigate to [https://www. dentsplysirona.com/de-de] Observe load time and rendering.
Expected Results Page loads in ~2–3 seconds (normal load time on iOS 18.5 and earlier). Layout renders progressively, no long blocking tasks.
Actual Results Page takes ~24 seconds to fully load. Rendering stalls before first paint. Same page on iOS 18.5 loads quickly, so this appears to be a regression introduced in 18.6. Additional Notes- Issue affects both Safari and in-app WebViews (WKWebView).
Desktop Safari 18 (macOS) does not show this issue. Clearing cache/cookies does not help. Happens consistently across multiple sites with moderate JavaScript and CSS payloads. Possibly related to JS parsing/render pipeline regression introduced in iOS 18.6.
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| Add attachment proposed patch, testcase, etc. |
Alexey Proskuryakov
*** This bug has been marked as a duplicate of bug 298222 ***