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Peter (Peter Hedenskog)
Software Engineer, Wikimedia Foundation

Projects (6)

Today

  • Clear sailing ahead.

Tomorrow

  • Clear sailing ahead.

Thursday

  • Clear sailing ahead.

User Details

User Since
Aug 17 2015, 6:48 PM (201 w, 1 d)
Availability
Available
IRC Nick
phedenskog
LDAP User
Unknown
MediaWiki User
PHedenskog (WMF) [ Global Accounts ]

Recent Activity

Thu, Jun 20

Peter created T226182: Alerts fired for SpeedIndex on mobile even though we should check for mwCentralNoticeBanner.
Thu, Jun 20, 1:32 PM · Performance-Team, WebPageTest

Tue, Jun 18

Peter added a comment to T225598: webpagetest-alerts grafana alert.

FYI: Today when we get an alert email, we look into the issue, but we haven't documented the process and how to "think", lets do that in T225987.

Tue, Jun 18, 6:57 AM · Performance-Team
Peter created T225987: Create runbook on what to do when we get an alert.
Tue, Jun 18, 6:56 AM · WebPageTest, WebPageReplay, Performance-Team
Peter lowered the priority of T225598: webpagetest-alerts grafana alert from High to Normal.

Hi @ayounsi I've tracked this in T225403. The reason is that when we updated to Chrome 75, we could see that it's slower for both WebPageTest and Browsertime/WebPageReplay when we run it in emulated mobile mode. So we gonna keep that task open until we have enough users on mobile that uses 75 and see if we can get the same pattern there, then we will create an upstream issue in Chrome (last week 75 wasn't released yet on Android when I tried it out).

Tue, Jun 18, 6:53 AM · Performance-Team

Mon, Jun 17

Peter added a comment to T218618: Consider disabling Chrome Lite pages for Wikipedia on Chrome on mobile with Cache-Control: no-transform.

In Chrome 77 it will be possible to "try" it out again: https://cs.chromium.org/chromium/src/components/previews/README

Mon, Jun 17, 8:18 PM · Performance-Team (Radar), WMF-Legal, Security-Team, Privacy
Peter moved T225416: Unify synthetic testing scripts from Inbox to Doing on the Performance-Team board.
Mon, Jun 17, 8:15 PM · WebPageReplay, WebPageTest, Performance-Team
Peter moved T225598: webpagetest-alerts grafana alert from Doing to Backlog: Small & Maintenance on the Performance-Team board.
Mon, Jun 17, 8:13 PM · Performance-Team
Peter claimed T225598: webpagetest-alerts grafana alert.
Mon, Jun 17, 7:52 PM · Performance-Team

Fri, Jun 14

Peter added a comment to T220838: Upgrade grafana to 6.x.

If we could upgrade to 6.2.x that would be great. I've been using it for my projects for a while and the lazy loading of panels out of view really makes large dashboards working better (and faster). We have a couple of dashboards in the performance team that are really slow.

Fri, Jun 14, 5:10 AM · observability, Operations

Thu, Jun 13

Peter added a comment to T225403: Investigate increase in First Visual Change mobile enwiki.

Yep got a small change on Browsertime/WebPageReplay too (one tick):

Thu, Jun 13, 1:18 PM · Performance-Team
Peter updated the task description for T214026: Create a list of what's needed for getting the mobile phone performance lab running.
Thu, Jun 13, 12:35 PM · Performance-Team
Peter reopened T214026: Create a list of what's needed for getting the mobile phone performance lab running, a subtask of T197847: Collect performance metrics from a mobile over time, as Open.
Thu, Jun 13, 12:33 PM · Performance-Team
Peter reopened T214026: Create a list of what's needed for getting the mobile phone performance lab running as "Open".

Re-open since we later this year probably can support iOS devices!

Thu, Jun 13, 12:33 PM · Performance-Team
Peter added a comment to T220751: [Bug] Extreme latency due to JavaScript parsing on DOM-heavy pages.

One last thing: It's good to turn on screenshots, that makes easier to understand what happens (--chrome.enableTraceScreenshots). Also I tried to add annotations to the timeline console.timeStamp("Test"); but I cannot get them to be visible in the gui (I see them in the trace log though).

Thu, Jun 13, 12:01 PM · Performance-Team (Radar), Readers-Web-Backlog, MW-1.34-notes (1.34.0-wmf.1; 2019-04-16)
Peter reassigned T220751: [Bug] Extreme latency due to JavaScript parsing on DOM-heavy pages from Peter to nray.

Signing over to you Nick to answer the questions.

Thu, Jun 13, 9:41 AM · Performance-Team (Radar), Readers-Web-Backlog, MW-1.34-notes (1.34.0-wmf.1; 2019-04-16)
Peter added a comment to T220751: [Bug] Extreme latency due to JavaScript parsing on DOM-heavy pages.

At least in theory you can tell the webdriver that you wanna have the control back asap the navigation has started (pageLoadStrategy on the webdriver world).

Thu, Jun 13, 9:40 AM · Performance-Team (Radar), Readers-Web-Backlog, MW-1.34-notes (1.34.0-wmf.1; 2019-04-16)
Peter added a comment to T220751: [Bug] Extreme latency due to JavaScript parsing on DOM-heavy pages.

I've had a go today to first try to automate it, so we can find these kind of things in the future when we have a performance device lab. First @nray for the original, that has been solved right?

Thu, Jun 13, 8:46 AM · Performance-Team (Radar), Readers-Web-Backlog, MW-1.34-notes (1.34.0-wmf.1; 2019-04-16)

Wed, Jun 12

Peter claimed T220751: [Bug] Extreme latency due to JavaScript parsing on DOM-heavy pages.

Oh @nray sorry I missed this, let me have a look first thing tomorrow.

Wed, Jun 12, 6:37 PM · Performance-Team (Radar), Readers-Web-Backlog, MW-1.34-notes (1.34.0-wmf.1; 2019-04-16)
Peter added a comment to T225403: Investigate increase in First Visual Change mobile enwiki.

I've pushed Chrome 75 now, let it run for the day and have another look.

Wed, Jun 12, 4:12 AM · Performance-Team

Mon, Jun 10

Peter created T225416: Unify synthetic testing scripts.
Mon, Jun 10, 11:02 AM · WebPageReplay, WebPageTest, Performance-Team
Peter added a comment to T225403: Investigate increase in First Visual Change mobile enwiki.

No change in WebPageReplay and I could see that it happened in the same time of Chrome 75 for WebPageTest. On Wednesday I'll roll out 75 for WebPageReplay and I can create an upstream task if we get it there too.

Mon, Jun 10, 10:45 AM · Performance-Team
Peter created T225403: Investigate increase in First Visual Change mobile enwiki.
Mon, Jun 10, 8:10 AM · Performance-Team

Thu, Jun 6

Peter closed T211487: Create on-wiki baseline page for our synthetic tests as Resolved.

Running both for WPT and WPR

Thu, Jun 6, 11:31 AM · WebPageTest, Performance-Team
Peter closed T203082: One dashboard to rule them all (to identify performance regressions) as Declined.

This is probably not practical: When we will create alerts for all Wikis we will do that on one dashboard per Wiki. Having everything (or something smart) on one dashboard is probably too complicated.

Thu, Jun 6, 11:28 AM · Performance-Team
Peter closed T217534: Create runbook for WebPageReplay as Resolved.

https://wikitech.wikimedia.org/wiki/Performance/Runbook/WebPageReplay

Thu, Jun 6, 10:33 AM · Performance-Team, WebPageReplay
Peter closed T215489: [Investigate] Measure time spent as a logged in user from different locations as Resolved.

Done in: https://wikitech.wikimedia.org/wiki/Performance/Synthetic_Measurement_Experiment_2019

Thu, Jun 6, 10:33 AM · Performance-Team
Peter closed T214026: Create a list of what's needed for getting the mobile phone performance lab running, a subtask of T197847: Collect performance metrics from a mobile over time, as Resolved.
Thu, Jun 6, 10:30 AM · Performance-Team
Peter closed T214026: Create a list of what's needed for getting the mobile phone performance lab running as Resolved.

The list is done.

Thu, Jun 6, 10:30 AM · Performance-Team
Peter moved T211381: Detect performance changes on deploy more quickly from Backlog: Small & Maintenance to Backlog: Future Goals on the Performance-Team board.
Thu, Jun 6, 10:27 AM · Performance-Team
Peter closed T207440: Chrome 69 -> Chrome 70 changes in metrics as Resolved.

This is one of the ones that we blogged about and Chrome acknowledged.

Thu, Jun 6, 10:20 AM · WebPageTest, WebPageReplay, Performance-Team
Peter added a comment to T210046: Integrate https://chromedevtools.github.io/timeline-viewer/ to our trace logs.

Yes it is fixed ... but I tested it yesterday and the timeline viewer doesn't support the new timings (fixed that yesterday). So I'm thinking as a long term solution we should remove what I did and ask people to use their local version of Chrome.

Thu, Jun 6, 10:11 AM · WebPageReplay, Performance-Team
Peter closed T203543: Chrome 69 increase time for first visual change in synthetic testing as Resolved.

We blogged about and get some feedback from the Chrome team that we found something.

Thu, Jun 6, 10:09 AM · WebPageReplay, Upstream, Performance-Team
Peter moved T188204: Test and create a WPT Agent on Cloud VPS from Backlog: Small & Maintenance to Backlog: Future Goals on the Performance-Team board.
Thu, Jun 6, 10:07 AM · WebPageTest, Performance-Team
Peter moved T203060: Evaluate deploying synthetic testing on bare metal from Backlog: Small & Maintenance to Backlog: Future Goals on the Performance-Team board.
Thu, Jun 6, 10:07 AM · Performance-Team
Peter closed T194807: Try out first input delay as Resolved.

Yes we do says @Gilles so closing

Thu, Jun 6, 10:05 AM · Performance-Team
Peter added a comment to T205601: Clean up start script for WebPageReplay.

When we move to the new setup this will be automatically fixed and will be in Git.

Thu, Jun 6, 10:03 AM · WebPageReplay, Performance-Team
Peter closed T204345: Wrong images are picked up in Browsertime/WebPageReplay on Mobile as Resolved.

This is fixed now

Thu, Jun 6, 10:02 AM · Performance-Team, WebPageReplay
Peter closed T196312: Fine tune WebPageTest alerts as Resolved.

This works better now when we moved to 30 fps for the video.

Thu, Jun 6, 9:58 AM · WebPageTest, Performance-Team
Peter closed T196312: Fine tune WebPageTest alerts, a subtask of T196242: Chrome 67 performance regression, as Resolved.
Thu, Jun 6, 9:58 AM · Performance-Team (Radar), Upstream
Peter closed T192536: High variance in Chrome for one of the URLs on the Japanese Wikipedia as Declined.

T190020 can make it easier to get better metrics.

Thu, Jun 6, 9:55 AM · Performance-Team, WebPageTest
Peter added projects to T190020: Different strokes for different URLs: WebPageReplay, WebPageTest.
Thu, Jun 6, 9:52 AM · WebPageTest, WebPageReplay, Performance-Team
Peter added a comment to T185741: Alert on log errors on Browsertime/WebPageReplay.

Let us fix that when we have the new setup.

Thu, Jun 6, 9:45 AM · Performance-Team
Peter added a comment to T164714: Calculate parsing speed for JavaScript on mobile.

We will automatically have this when we have the mobile device lab.

Thu, Jun 6, 9:43 AM · Mobile, Performance-Team
Peter added a parent task for T164714: Calculate parsing speed for JavaScript on mobile: T136850: Test performance on real mobile devices.
Thu, Jun 6, 9:42 AM · Mobile, Performance-Team
Peter added a subtask for T136850: Test performance on real mobile devices: T164714: Calculate parsing speed for JavaScript on mobile.
Thu, Jun 6, 9:42 AM · Performance-Team, Epic
Peter added a comment to T153301: Make it easy to compare WebPageTest results on alerts.

I think we should do this differently: On alerts we should pre-populate a link with runs before/after a alert, so you as a user just have a link to click on that automatically fills in the right values into the compare page.

Thu, Jun 6, 9:41 AM · Upstream, WebPageTest, Performance-Team
Peter renamed T153301: Make it easy to compare WebPageTest results on alerts from Make it easier compare WebPageTest results to Make it easy to compare WebPageTest results on alerts.
Thu, Jun 6, 9:40 AM · Upstream, WebPageTest, Performance-Team
Peter added a comment to T159668: WebPageTest private server loads assets from Google.

Yeah I've modified our instance but that's is no long term solution. Some time ago I added it back, so we more easily can keep our server update.

Thu, Jun 6, 8:59 AM · Performance-Team, Upstream, WebPageTest
Peter added a comment to T175708: Add annotations per URL tested in WebPageTest.

Moving to the new setup after the summer we will automatically have it.

Thu, Jun 6, 8:57 AM · WebPageReplay, Performance-Team, WebPageTest
Peter added a comment to T118133: Devise a proper configuration file format for WebPageTest jobs.

When we move this to the new setup all configuration will be in JSON and will be much easier than the current setup.

Thu, Jun 6, 8:50 AM · WebPageTest, Performance-Team

Mon, Jun 3

Peter created T224896: Deploy and test WebPageTest agent in Cape Town (early 2020).
Mon, Jun 3, 3:22 PM · Performance-Team, WebPageTest

Tue, May 28

Peter added a comment to T214027: Collect mobile phone statistics and send them to Graphite.

The simplest way to get the temperature is:

adb -s ZY3222N2CZ shell dumpsys battery | grep temperature | grep -Eo '[0-9]{1,3}'
Tue, May 28, 5:16 AM · Performance-Team

Mon, May 27

Peter created T224427: Compare performance against Alexa top 10.
Mon, May 27, 1:43 PM · Performance-Team

May 23 2019

Peter added a comment to T223502: Test out different fps .

I've changed so default is 30 instead of null as a hack. If it works good I'll make a PR for the API.

May 23 2019, 4:53 AM · Performance-Team, WebPageTest

May 21 2019

Peter added a comment to T223502: Test out different fps .

I looked into the code and there is a hidden query fps parameter that you can use. There's two ways to do that:

  1. Add support to the WPT API (I can do a PR for that)
  2. Hack and set it to 30 fps per default (the same way we hacked setting Visual Elements on all runs.
May 21 2019, 7:39 AM · Performance-Team, WebPageTest

May 20 2019

Peter moved T223101: Measure most common use case for users from Doing to Backlog: Small & Maintenance on the Performance-Team board.
May 20 2019, 8:02 PM · WebPageTest, Performance-Team
Peter moved T223502: Test out different fps from Inbox to Doing on the Performance-Team board.
May 20 2019, 8:01 PM · Performance-Team, WebPageTest
Peter added a comment to T218618: Consider disabling Chrome Lite pages for Wikipedia on Chrome on mobile with Cache-Control: no-transform.

We got feedback in the upstream issue that there's no way to test today but they will add a flag: https://bugs.chromium.org/p/chromium/issues/detail?id=956685#c13

May 20 2019, 7:28 AM · Performance-Team (Radar), WMF-Legal, Security-Team, Privacy

May 17 2019

Peter added a comment to T223502: Test out different fps .

Looks like you only can set the fps for the video per agent (when you start the agent): https://github.com/WPO-Foundation/wptagent/blob/829a9f8111ae8bcf52c99ff574bcec3c924ebd9e/README.md#video-capturedisplay-settings

May 17 2019, 5:30 AM · Performance-Team, WebPageTest
Peter created T223502: Test out different fps .
May 17 2019, 5:05 AM · Performance-Team, WebPageTest

May 13 2019

Peter closed T184681: Document how to run performance tests on real phones as Resolved.

I think we can close it and the next time someone tries it out and it doesn't work, let us update the docs!

May 13 2019, 8:17 PM · Readers-Web-Backlog (Tracking), Mobile, Documentation, Performance-Team
Peter closed T184681: Document how to run performance tests on real phones, a subtask of T184527: Test performance win with lazy references on a real mobile phone, as Resolved.
May 13 2019, 8:17 PM · Performance-Team
Peter closed T207251: Test out different trace settings for Chrome as Resolved.

I've updated Browsertime to use Tracium and a setup that catch more log events, that will work perfect for us. It will work the next time we update.

May 13 2019, 8:16 PM · Browser-Support-Google-Chrome, WebPageReplay, Performance-Team
Peter moved T223101: Measure most common use case for users from Inbox to Doing on the Performance-Team board.
May 13 2019, 7:44 PM · WebPageTest, Performance-Team
Peter moved T223103: Make it easy for developers to add new URLs to continously test from Inbox to Backlog: Future Goals on the Performance-Team board.
May 13 2019, 7:44 PM · WebPageTest, WebPageReplay, Performance-Team
Peter renamed T223103: Make it easy for developers to add new URLs to continously test from Make it easy for developers to add new URLs to test to Make it easy for developers to add new URLs to continously test.
May 13 2019, 6:52 PM · WebPageTest, WebPageReplay, Performance-Team
Peter added projects to T223103: Make it easy for developers to add new URLs to continously test: WebPageReplay, WebPageTest.
May 13 2019, 1:45 PM · WebPageTest, WebPageReplay, Performance-Team
Peter created T223103: Make it easy for developers to add new URLs to continously test.
May 13 2019, 1:44 PM · WebPageTest, WebPageReplay, Performance-Team
Peter created T223101: Measure most common use case for users.
May 13 2019, 1:33 PM · WebPageTest, Performance-Team

May 6 2019

Peter created T222565: Throttle the CPU for mobile testing.
May 6 2019, 5:24 AM · WebPageReplay, Performance-Team

Apr 29 2019

Peter moved T205722: Prepare materials for internal synthetic testing presentation from Doing to Backlog: Small & Maintenance on the Performance-Team board.
Apr 29 2019, 8:31 PM · Performance-Team
Peter added a comment to T220751: [Bug] Extreme latency due to JavaScript parsing on DOM-heavy pages.

Hi @nray can we do this in two steps? Since we missed it, I think we should try out first to instrument it. We could use https://developer.mozilla.org/en-US/docs/Web/API/User_Timing_API (we already use that for the startup module)? If we can make sure that we measure it, and push it first, then we get some data from real users, before you push the fix. That way we can make sure it is a real issue today, fix it and enjoy the win of the fix and maybe blog about it :)

Apr 29 2019, 12:57 PM · Performance-Team (Radar), Readers-Web-Backlog, MW-1.34-notes (1.34.0-wmf.1; 2019-04-16)

Apr 26 2019

Peter added a project to T220751: [Bug] Extreme latency due to JavaScript parsing on DOM-heavy pages: Performance-Team.
Apr 26 2019, 12:04 PM · Performance-Team (Radar), Readers-Web-Backlog, MW-1.34-notes (1.34.0-wmf.1; 2019-04-16)
Peter closed T220796: Chrome 73 introduced higher deviation in metrics as Resolved.

It become better with 74 but we still have some bad values in median.

Apr 26 2019, 5:40 AM · WebPageReplay, Performance-Team
Peter closed T221823: Investigate first visual change performance alert on emulated mobile as Resolved.

Since this is Chrome running in emulated mode, it's hard to say if it will affect users or not. At least know we know the reason for the increase.

Apr 26 2019, 5:28 AM · Performance-Team, WebPageTest
Peter added a comment to T221823: Investigate first visual change performance alert on emulated mobile.

We had the same thing on WebPageReplay too. I actually didn't pay attention to it since we had so unstable metrics on Desktop with 73 T220796

Apr 26 2019, 5:27 AM · Performance-Team, WebPageTest

Apr 25 2019

Peter added a comment to T214027: Collect mobile phone statistics and send them to Graphite.

I've been listening to the Chrome teams setup and they wait for the battery heat to come down before they make the next run (to get more stable metrics). It wasn't something I saw as an issue when I run the tests before but we should prepare for getting those numbers (it should be pretty straight forward).

Apr 25 2019, 8:03 PM · Performance-Team
Peter added a comment to T221819: Dissect how Chrome Mobile 74+ Lite mode, Opera Mini, UC Mini work and write a blog post about it.

Upstream: https://bugs.chromium.org/p/chromium/issues/detail?id=956685

Apr 25 2019, 6:51 PM · Performance-Team
Peter added a comment to T221819: Dissect how Chrome Mobile 74+ Lite mode, Opera Mini, UC Mini work and write a blog post about it.

Let me create an upstream issue asking the correct way to test/turn it on + ask more on how it actually works. I'll do that later tonight.

Apr 25 2019, 4:35 PM · Performance-Team
Peter added a comment to T221819: Dissect how Chrome Mobile 74+ Lite mode, Opera Mini, UC Mini work and write a blog post about it.

Should we really spend time on it, I think we should just add the header. Its something we should have had for a long time + until we know exactly how it works, I'm a skeptical.

Apr 25 2019, 3:49 PM · Performance-Team
Peter created T221823: Investigate first visual change performance alert on emulated mobile.
Apr 25 2019, 7:29 AM · Performance-Team, WebPageTest

Apr 24 2019

Johan awarded Blog Post: Evaluating Element Timing for Images a Like token.
Apr 24 2019, 11:45 AM

Apr 23 2019

Peter added a comment to T218618: Consider disabling Chrome Lite pages for Wikipedia on Chrome on mobile with Cache-Control: no-transform.

Hmm, I enabled it again today to test it out and now the "Lite" bubble is removed and there's nothing signal that I'm using a Lite page. I could see that I'm on a Lite page though since no images is loading. Have we seen any drop in traffic since it was released?

Apr 23 2019, 1:42 PM · Performance-Team (Radar), WMF-Legal, Security-Team, Privacy
Peter closed T217732: Add documentation for setting up a new agent as Resolved.

I've updated our documentation.

Apr 23 2019, 1:33 PM · Documentation, WebPageTest, Performance-Team
Peter closed T217732: Add documentation for setting up a new agent, a subtask of T192050: Use Docker version of WebPageTest agents, as Resolved.
Apr 23 2019, 1:33 PM · Upstream, WebPageTest, Performance-Team

Apr 15 2019

Peter moved T220796: Chrome 73 introduced higher deviation in metrics from Inbox to Doing on the Performance-Team board.
Apr 15 2019, 7:59 PM · WebPageReplay, Performance-Team
Peter added a comment to T192050: Use Docker version of WebPageTest agents.

I continued to test and added the --init to get the rid of the zombie processes. That worked, but after 24 h (or so) Firefox started to fail again. I have reverted back to the old agent and hope to get some attention upstream.

Apr 15 2019, 5:03 PM · Upstream, WebPageTest, Performance-Team
Peter updated the task description for T192050: Use Docker version of WebPageTest agents.
Apr 15 2019, 5:01 PM · Upstream, WebPageTest, Performance-Team

Apr 14 2019

Peter added a comment to T220796: Chrome 73 introduced higher deviation in metrics.

It looks that 74 gives less variation (but probably not as 72):

Apr 14 2019, 1:02 PM · WebPageReplay, Performance-Team

Apr 13 2019

Tgr awarded Blog Post: Evaluating Element Timing for Images a Like token.
Apr 13 2019, 11:19 PM

Apr 12 2019

Peter added a comment to T192050: Use Docker version of WebPageTest agents.

Ok Firefox worked when I started the container but something happens and now it looks like this again:

Apr 12 2019, 12:13 PM · Upstream, WebPageTest, Performance-Team
Peter added a comment to T220796: Chrome 73 introduced higher deviation in metrics.

Also enabled 74 for enwiki. I think it looks better on variation but maybe some URLs are slower. Need to run it through the weekend and see what it looks like.

Apr 12 2019, 12:11 PM · WebPageReplay, Performance-Team
Peter added a comment to T220796: Chrome 73 introduced higher deviation in metrics.

No it was not across all wikis. Testing 74 now on German, Spanish, Japanese, Chinese and Russian Wikipedia

Apr 12 2019, 10:08 AM · WebPageReplay, Performance-Team
Peter added a comment to T220796: Chrome 73 introduced higher deviation in metrics.

No change for Firefox at the same moment, that indicates that there's no change in the Browsertime side, rather a Chrome problem. I'll try out a beta of 74 and see if something changes.

Apr 12 2019, 9:45 AM · WebPageReplay, Performance-Team
Peter created T220796: Chrome 73 introduced higher deviation in metrics.
Apr 12 2019, 9:38 AM · WebPageReplay, Performance-Team
Peter added a comment to T192050: Use Docker version of WebPageTest agents.

I went through all the tests I ran before on the Dockerized version and then the Firefox tests worked: http://wpt.wmftest.org/result/190403_4N_CA/

Apr 12 2019, 5:00 AM · Upstream, WebPageTest, Performance-Team

Apr 11 2019

Krinkle awarded Blog Post: Evaluating Element Timing for Images a Love token.
Apr 11 2019, 12:01 AM

Apr 10 2019

Peter added a comment to T192050: Use Docker version of WebPageTest agents.

I like logs but the logs for WPT is really heard to follow. Here's a snippet from the container:

Apr 10 2019, 8:47 AM · Upstream, WebPageTest, Performance-Team
Peter published Blog Post: Evaluating Element Timing for Images.
Apr 10 2019, 8:24 AM
Peter added a project to T192050: Use Docker version of WebPageTest agents: Upstream.

Created an upstream issue asking for help: https://github.com/WPO-Foundation/wptagent/issues/253

Apr 10 2019, 7:37 AM · Upstream, WebPageTest, Performance-Team