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Issue 864200 link

Starred by 1 user
Status: Assigned
Owner:
bengr@chromium.org
Components:
EstimatedDays: ----
NextAction: ----
OS: Android
Pri: 3
Type: Bug



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Understand why loading page on 3G is so slow

Project Member Reported by mdw@chromium.org, Jul 16 
This is a good test case for Breve optimizations for slow pages on 3G networks.

Chrome Version: 69.0.3475.0
OS: Android

What steps will reproduce the problem?
(1) Be in Nairobi on a 3G network (Project Fi in this case, roaming)
(2) Load http://tamarind.co.ke

The loading bar completes quickly but then takes ~11 seconds to show a spinner on the page, and ~24 seconds to paint the page's content. Video attached.

Note that loading this page in Opera Mini is much faster. Also, loading this page via sCASPR (using Chrome flags to force it) is also pretty fast.

There seems to be a problem with (a) the loading speed and (b) the loading bar UI indicator completing too quickly.
2018_07_12_12_57_07.mp4
23.3 MB Download

Comment 1 by bengr@chromium.org, Jul 17 

I generated a lighthouse report (see attached), which confirm the page is slow. FCP is 2.8s, but TTI is 46 seconds, on a simulated fast 3G network. Most of this seems to be due to an enormous data transfer (almost 15MB).
tamarind.co.ke_2018-07-16_17-41-38.html
1.0 MB View Download

Comment 2 by bengr@chromium.org, Jul 17 

There's also significant main thread work.
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