Using the per-revision bisect providing the bisect results,
Good build:56.0.2900.0 (Revision:427219)
Bad build:56.0.2901.0 (Revision:427541)

You are probably looking for a change made after 427425 (known good), but no later than 427426 (first known bad).

CHANGELOG URL:

The script might not always return single CL as suspect as some perf builds might get missing due to failure.
  https://chromium.googlesource.com/chromium/src/+log/a5d3239d0abd54d3a4d37ae15c6cccd92f6122d0..6d67024bbbca61ddad11c5c242e30953af582637

From the CL above, assigning the issue to the concern owner 

@hcarmona - Could you please check whether this is caused with respect to your change, if not please help us in assigning it to the right owner.

Review-Url: https://codereview.chromium.org/2448653002

Thanks!

Tested the issue on Latest Canary# 57.0.2926.0 on Windows, Mac and Linux and is still reproducible.
@hcarmona - Could you please look into the issue and update.
Thanks in Advance.

Just for update, Still able to reproduce the issue on Mac 10.11.6 using latest chrome version 57.0.2935.0.

hcarmona@ Could you please look into this issue.

Thanks!

Just for update, Still able to reproduce the issue on Mac 10.12.2 using latest chrome version 57.0.2956.0.

hcarmona@ Could you please look into this issue.

Thanks!

Just for update, Still able to reproduce the issue on Mac 10.12.2 and Win-10 using latest chrome version 57.0.2970.0.

hcarmona@ - Friendly Ping...!!

Could you please have a look into this issue.

Thanks...!!

Update on this issue:

Looks like the loading delay is happening only during the first navigation to the sub page when clicking the link.

This might be related to the sub page animation because navigating directly to chrome://md-settings/passwords does not have a delayed load.

However, chrome://md-settings/searchEngines (similar code) doesn't have the same load delay. I'm currently investigating this.

Just for update, Still able to reproduce the issue on Mac 10.12.2 using latest chrome version 58.0.2990.0.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/7320f5e364e6c02b2d044612e4e488d70bb1e24f

commit 7320f5e364e6c02b2d044612e4e488d70bb1e24f
Author: hcarmona <hcarmona@chromium.org>
Date: Thu Feb 16 21:07:02 2017

Load Passwords and Autofill in the corresponding sub page.

Moving the load into the sub page fixes the delay that is seen when
navigating into the passwords sub page. This has the added advantage
that items are not loaded at the top page.

BUG= 665748 
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:closure_compilation

Review-Url: https://codereview.chromium.org/2627123002
Cr-Commit-Position: refs/heads/master@{#451096}

[modify] https://crrev.com/7320f5e364e6c02b2d044612e4e488d70bb1e24f/chrome/browser/resources/settings/passwords_and_forms_page/autofill_section.js
[modify] https://crrev.com/7320f5e364e6c02b2d044612e4e488d70bb1e24f/chrome/browser/resources/settings/passwords_and_forms_page/passwords_and_forms_page.html
[modify] https://crrev.com/7320f5e364e6c02b2d044612e4e488d70bb1e24f/chrome/browser/resources/settings/passwords_and_forms_page/passwords_and_forms_page.js
[modify] https://crrev.com/7320f5e364e6c02b2d044612e4e488d70bb1e24f/chrome/browser/resources/settings/passwords_and_forms_page/passwords_section.js
[modify] https://crrev.com/7320f5e364e6c02b2d044612e4e488d70bb1e24f/chrome/test/data/webui/settings/passwords_and_autofill_fake_data.js
[modify] https://crrev.com/7320f5e364e6c02b2d044612e4e488d70bb1e24f/chrome/test/data/webui/settings/passwords_and_forms_browsertest.js
[modify] https://crrev.com/7320f5e364e6c02b2d044612e4e488d70bb1e24f/chrome/test/data/webui/settings/settings_autofill_section_browsertest.js
[modify] https://crrev.com/7320f5e364e6c02b2d044612e4e488d70bb1e24f/chrome/test/data/webui/settings/settings_passwords_section_browsertest.js

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/7320f5e364e6c02b2d044612e4e488d70bb1e24f

commit 7320f5e364e6c02b2d044612e4e488d70bb1e24f
Author: hcarmona <hcarmona@chromium.org>
Date: Thu Feb 16 21:07:02 2017

Load Passwords and Autofill in the corresponding sub page.

Moving the load into the sub page fixes the delay that is seen when
navigating into the passwords sub page. This has the added advantage
that items are not loaded at the top page.

BUG= 665748 
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:closure_compilation

Review-Url: https://codereview.chromium.org/2627123002
Cr-Commit-Position: refs/heads/master@{#451096}

[modify] https://crrev.com/7320f5e364e6c02b2d044612e4e488d70bb1e24f/chrome/browser/resources/settings/passwords_and_forms_page/autofill_section.js
[modify] https://crrev.com/7320f5e364e6c02b2d044612e4e488d70bb1e24f/chrome/browser/resources/settings/passwords_and_forms_page/passwords_and_forms_page.html
[modify] https://crrev.com/7320f5e364e6c02b2d044612e4e488d70bb1e24f/chrome/browser/resources/settings/passwords_and_forms_page/passwords_and_forms_page.js
[modify] https://crrev.com/7320f5e364e6c02b2d044612e4e488d70bb1e24f/chrome/browser/resources/settings/passwords_and_forms_page/passwords_section.js
[modify] https://crrev.com/7320f5e364e6c02b2d044612e4e488d70bb1e24f/chrome/test/data/webui/settings/passwords_and_autofill_fake_data.js
[modify] https://crrev.com/7320f5e364e6c02b2d044612e4e488d70bb1e24f/chrome/test/data/webui/settings/passwords_and_forms_browsertest.js
[modify] https://crrev.com/7320f5e364e6c02b2d044612e4e488d70bb1e24f/chrome/test/data/webui/settings/settings_autofill_section_browsertest.js
[modify] https://crrev.com/7320f5e364e6c02b2d044612e4e488d70bb1e24f/chrome/test/data/webui/settings/settings_passwords_section_browsertest.js