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iOS consistently taking 2.5s to start render after downloads completed
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iOS consistently taking 2.5s to start render after downloads completed
08-03-2016, 04:05 AM
Post: #1
iOS consistently taking 2.5s to start render after downloads completed
At first I thought it was maybe due to the way I was loading images, but after further testing on WPT and on real devices locally, I'm pretty sure there is something unexpected happening on the WPT iOS device.

I created two test pages to test my theory, one with an empty body and one with just the text "TEST" in the body. I ran both through WPT on the real iPhone. Here are the results:

Blank:
http://staging.lovetoknow.com/wpt-ios-blank.html
http://www.webpagetest.org/result/160802_W7_14JD/

TEST:
http://staging.lovetoknow.com/wpt-ios-test.html
http://www.webpagetest.org/result/160802_A7_14K4/

It consistently takes ~2.5s between the time after the html file has downloaded completely and the text "TEST" is displayed in the filmstrip view.

It does the same thing on a more complex page between the time when it has enough content to start rendering and when it actually starts rendering, but I wanted to show with these tests that it wasnt anything else causing the delay.

Any idea why this is happening and how to get reliable iPhone tests?
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iOS consistently taking 2.5s to start render after downloads completed - joshcoady - 08-03-2016 04:05 AM

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