Does this require logging into the site?  If so, do you have a set of test credentials we can use to reproduce?

Yes, we have a test account with a bunch of e-mails in inbox, which allows for extended scrolling durations and more thorough frame stats.

szager, can I send you that account credentials via e-mail?

Yes, please send test credentials to szager@chromium.org, thanks.

Adding label Needs-Feedback as per comment#4 and #5 and requesting reporter to share the test credentials to the mentioned mail ID(szager@chromium.org).

Thanks!

I haven't been able to reproduce the perf difference. The links you provided in the original bug report appear to have expired. Could you provide more details on how you got your results?

I'm using test credentials for mail.yandex.ru, and this patch to the chromium source:

$ git diff
diff --git a/tools/perf/page_sets/top_25_smooth.py b/tools/perf/page_sets/top_25_smooth.py
index 21e24a20f70e..0e50e0295cc3 100644
--- a/tools/perf/page_sets/top_25_smooth.py
+++ b/tools/perf/page_sets/top_25_smooth.py
@@ -142,6 +142,7 @@ _PAGE_URLS = [
   ('http://sports.yahoo.com/', 'yahoo_sports'),
   # Why: top tech blog
   ('http://techcrunch.com', 'techcrunch'),
+  ('https://mail.yandex.ru', 'yandex'),
 ]


I then run the perf benchmark with this command:

$ src/tools/perf/run_benchmark run smoothness.top_25_smooth --profile-dir=/path/to/chrome/profile/signed/in/with/test/credentials --story-filter=yandex --use-live-sites

... and then I run a second time, adding this flag:

--extra-browser-args=--disable-features=RootLayerScrolling

I have attached screen shots of the results page for both runs; the numbers for frame time are almost identical.

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Fixed attachment.

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Hello!

Do you disable gpu-rasterization? Try to add --disable-gpu-rasterization flag.
I attached our perf results in html.

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results (1).html.zip 1.4 MB Download

Thank you for providing more feedback. Adding the requester to the cc list.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

FYI, I am looking into this, but still have not been able to reproduce the regression.  My latest results (attached), with --disable-gpu-rasterization, do show a performance regression, but much smaller than what you've observed.

I have been running on Linux; tomorrow I'll try on Windows. I think it's unlikely to make a difference, but we'll see.

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Our slow perf-bots are Dell Latitude E4300 notebooks.
It is rather slow machine with Core 2 Duo 2.5Ghz, Intel GMA X4500, 4GB RAM and HDD.

As per comment #8, the issue is already been taken care by szager@ and the issue need to be tested using Python 2.6, Port 80 and Port 53 UDP and TCP to support DNS traffic which is out of TE-scope. Hence, adding label TE-NeedsTriageHelp for further investigation from dev team.

Thanks...!!