[Webkit-unassigned] [Bug 212757] 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

Paul Calvano <paulcalvano at yahoo.com> changed:

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                 CC|                            |paulcalvano at yahoo.com

--- Comment #1 from Paul Calvano <paulcalvano at yahoo.com> ---
Hello. I'm seeing this performance degradation across 37% of sites measured w/ our real user measurement service. This includes many large e-commerce and media websites. 

I've shared some details in this twitter thread - https://twitter.com/paulcalvano/status/1268114487426666496

The slowdown became apparent once 13.1 was the majority of Mobile Safari traffic. However I can see that 13.1 was consistently slower for those sites.  The slowdown appears to be occurring between the DOM Content Loaded End time and the DOM Complete time. 

Please let me know if there are any additional details I can provide to help triage this.

- Paul

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