Trust neither. The most optimal option I’ve found is webpagetest.org Its been quite handy lately. This tool does look interesting.

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over 1 year ago

Webpagetest.org is another. Pagespeedinsights and lighthouse are great for identifying page load issues to fix, but actual page load times will always vary between the user and your web server. Universal analytics has some page load timings but that’s going away soon and nothing afaik is in GA4. I’ve seen an example of building a page load timer in tag manager and dumping the results into an event.

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over 1 year ago

So I am working on rebuilding our company’s site with a new stack. I am running tests using webpagetest.org, and I am having trouble fully understanding the speed index results as well as the film strip view. The page renders quite fast everywhere I test it. Google Lighthouse shows it in the 90s + for performance score, however when I test the page on webpagetest, I get load times of 77 seconds (NOT MS) which is…

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over 1 year ago

Webpagetest.org is great, and checking OP’s site they have done an incredible job, I don’t think I have ever made or seen an Ecom site this slick. Super clean waterfall view.

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over 1 year ago

Thanks for the recommendation regarding webpagetest.org, another user made a similar recommendation so I will check it out.

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over 1 year ago

Thank you, I will check out webpagetest.org, you have a point about tag manager too.

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over 1 year ago

Starting to make a big push for accessibility at my company and was wondering what kind of tools, websites, or services you all use to catch some of the low hanging fruit with automation? I’ve used sites like webpagetest.org for performance diagnostics, hoping something similar exists in the accessibility space. Thanks for your insights!

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over 1 year ago

Use webpagetest.org – it will give you great suggestions on what/how to fix and with the paid version let you test out those ideas to guesstimate impact to your site. Pretty solid.

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over 1 year ago

Lighthouse doesn’t provide as much info as webpagetest.org where you can look at the waterfall and find out what’s slowing things down.

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over 1 year ago

I’ve also got no experience with that webpagetest.org site, but if it’s saying that lazyloading hasn’t be removed, then you’ve either removed it from the wrong place, or its referring to something else, or its using a cached version of the page. You should be able to see for yourself if you open the page and use your browsers dev tools to inspect the slideshow and find if the slides have loading=”lazy” on them.

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almost 2 years ago

I’m using Sense theme – I figured out that it can be done in the slideshow.liquid – but no idea how. Removing “loading=”lazy” from that file doesn’t do anything – tested it with webpagetest.org – no changes between before and after.

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almost 2 years ago

For webpagetest.org – it’s around 3.5s.

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almost 2 years ago

Test your site using webpagetest.org.

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almost 2 years ago

I’ve used GTMetrix and webpagetest.org along with pagespeed insights. Their results align though GTMetrix shows much better score as it’s limited for desktop only.

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almost 2 years ago

I also tested with webpagetest.org by blocking googletagmanager.com and speed is improving. So yes, GTM is causing the delay IMO. I’m looking to optimize it as much as possible.

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almost 2 years ago

You may take some some on Hetzner and run https://webpagetest.org against it from multiple points of the world and see the differences in TTFB/latency, should be enough for high level estimation.

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almost 2 years ago

To get an accurate picture of the load time for your target market I recommend using https://webpagetest.org.

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about 2 years ago

Did you try to simulate the user experience from a different country using for example webpagetest.org?

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about 2 years ago

If you are truly concerned about interactive responsiveness go to webpagetest.org and try a number of common websites you use under Cricket and USM SIM and compare (ideally around the same time). The data there is unparalleled. You can compare first byte and start render times. I would clear out your browser cache between runs.

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about 2 years ago

I tested on Webpagetest.org and UpCloud came in for 2 seconds faster for Full Content Paint. TTFB was the same.

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over 2 years ago

We can make a web page test (using a tool like WebPageTest or Google’s PageSpeed Insights which is also available as a Lighthouse performance audit in our browsers developer tools) before and after activating performance settings. We should see an improvement, often taking our page from an initial slow score indicated in red to a better score in yellow (or, rarely, especially for minimalist sites avoiding stupid…

– Source: dev.to
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over 2 years ago