[Webkit-unassigned] [Bug 212757] New: Performance degraded from 10th May after users migrated to iOS 13.4 or up on Iphone Mobile Safari

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=212757

            Bug ID: 212757
           Summary: Performance degraded from 10th May after users
                    migrated to iOS 13.4 or up on Iphone Mobile Safari
           Product: WebKit
           Version: Safari 13
          Hardware: iPhone / iPad
                OS: iOS 13
            Status: NEW
          Severity: Major
          Priority: P2
         Component: DOM
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: sgaurav786 at gmail.com

Hi Team,

We do real time user performance monitoring and found out that from 10th May onwards response time degraded by 1.2 to 1.7 secs on Iphone Mobile Safari browser. 
>From 10th May majority of the user traffic switched to iOS 13.4 or up. Seems Mobile Safari 13.1 was shipped with iOS 13.4. 

Seems more time is taken between DOMContentLoadedStart and DOMContentLoadedEnd event. 

We see similar issues/trend across other webistes also. 

Can you please investigate and provide more details on this issue?

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