How remove reduce render-blocking round trips

[Lee David]

Hi
I use PageSpeed Insights test my website. It shows "PSI estimates this page requires 4 render-blocking round trips and ~32 resources (0.2MB) to load. The median page requires 4 render-blocking round trips and ~75 resources (1MB) to load. Fewer round trips and bytes results in faster pages."

I want to you how to reduce render-blocking round trips, what tools can test which problem lead to this?

 I saw some website with 0 render-blocking round trips, and the got high score on PageSpeed Insights.

Thank you very much!

[Rick Steinwand]

You are loading too much in the head of your webpage (scripts or css) OR too much in the visible portion of the page (like too many images).

[Ibrahim Tanyalcin]

Hi Lee,

If you are working with older browsers that do not support es6 modules, I have written a module system in ES5 that uses promises if possible. The side effect of this is that all your scripts and dependencies can be dynamically loaded, thus making it non render blocking. Here is a bit of reading to get you going:

https://medium.com/@ibowankenobi/get-that-google-psi-score-higher-28a7c992966e

On Mon, May 14, 2018 at 2:15 PM, Rick Steinwand <rickst...@gmail.com> wrote:

You are loading too much in the head of your webpage (scripts or css) OR too much in the visible portion of the page (like too many images).

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[Nobody Here]

Hi, Im confused by the replies - Here is a link to a file that has no CSS, No JS, No images etc score 100% on Page speed but still says 4 render blocking trips and and funnily enough ~75 resources (1MB) to load,. which is just not true
http://waspnestremovalbradford.co.uk/render.html

So, I dont understand the replies. 

Thanks Gareth

[Nobody Here]

Hi, Im confused by the replies - Here is a link to a file that has no CSS, No JS, No images etc score 100% on Page speed but still says 4 render blocking trips and and funnily enough ~75 resources (1MB) to load,. which is just not true. Notably PSI calculates 0 render and 0MB however, I think the replies are misleading and or the authors are confusing the pudding. (Keep in mind it might be me confusing the pudding).

   Questions raise when I am clearly not the only person to be seeing the 4 render trip issue ~75 resource (1MB) comment which suggests that it might just be a default comment and out of our control, particularly when PSI also says 0  render trips and 0mb on my example file. In short, I know part of the question is how to reduce render blocking but I also think there are two issue here. PSI and then the 4 render ~75 resource and (1MB) issue, I am wondering if the later is misleading, please page speed test example url below. (will only be active until June 5th 2018, if after that the file is gone just make a html file with only text and nothing else in it and do a page test.

 

http://waspnestremovalbradford.co.uk/render.html

[Doantam Phan]

Hi there -- on this page: https://developers.google.com/speed/pagespeed/insights/?url=http%3A%2F%2Fwaspnestremovalbradford.co.uk%2Frender.html

PSI says "PSI estimates this page requires 0 render-blocking round trips and ~1 resources (0MB) to load. The median page requires 4 render-blocking round trips and ~75 resources (1MB) to load. Fewer round trips and bytes results in faster pages."

Perhaps the language could be improved here, but what this is means is that the current, tested page requires 0 render-blocking round trips and 1 resource, with approximately 0MB (rounded down) to load. The language about 'the median page' reflects the median page across all web pages. That is, out of all web pages in the data set, the median page takes 4 render-blocking round trips, 75 resources, and 1MB to load.

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[Nobody Here]

There is only 1 page - While i agree the language could be changed on Page Speed Insights, the median in this example is based on 1 page only, in other words how does 4 render-blocking round trips, 75 resources, and 1MB to load apply to 1 page with only text, no css, no images, no JS etc. You said its out of all web pages in the data set,   the median page takes 4 render-blocking round trips, 75 resources, and 1MB to load. As said, there is only 1 page and PSI says  0 render-blocking round trips and ~1 resources (0MB) to load. So the 'data-set' cant be 1MB or ~75 resources or need 4 trips

http://waspnestremovalbradford.co.uk/render.html

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[Doantam Phan]

Sorry, I think there's some confusion. The 'data set' I'm referring to is a sample of all web pages on the internet; not just the tested page or pages on the site. 

So, to update the statement: "The language about 'the median page' reflects the median page across a sample of all web pages on the internet. That is, out of a sample of all pages on the internet, the median page takes 4 render-blocking round trips, 75 resources, and 1MB to load."

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