WP Rocket - Advanced Options Prefetch DNS requests examples

DNS Prefetch domains

//maps.googleapis.com
//maps.gstatic.com
//fonts.googleapis.com
//fonts.gstatic.com
//ajax.googleapis.com
//apis.google.com
//google-analytics.com
//www.google-analytics.com
//ssl.google-analytics.com
//youtube.com
//api.pinterest.com
//cdnjs.cloudflare.com
//pixel.wp.com
//connect.facebook.net
//platform.twitter.com
//syndication.twitter.com
//platform.instagram.com
//disqus.com
//sitename.disqus.com
//s7.addthis.com
//platform.linkedin.com
//w.sharethis.com
//s0.wp.com
//s1.wp.com
//s2.wp.com
//s.gravatar.com
//0.gravatar.com
//2.gravatar.com
//1.gravatar.com
//stats.wp.com

https://docs.wp-rocket.me/article/1302-prefetch-dns-requests

Awesome! Thanks for this list, I appreciate your effort.

Thanks you for sharing.

Just what I was looking for. Thx a bunch.

I added:

//i.ytimg.com

For YT thumbnails

for jetpack cdn is not complete, there is s0, s1, s2

Here are a few more to consider adding:

//www.googletagmanager.com
//www.googletagservices.com
//adservice.google.com
//pagead2.googlesyndication.com
//tpc.googlesyndication.com
//bp.blogspot.com
//1.bp.blogspot.com
//2.bp.blogspot.com
//3.bp.blogspot.com
//4.bp.blogspot.com
//ajax.microsoft.com
//ajax.aspnetcdn.com
//s3.amazonaws.com
//code.jquery.com
//stackpath.bootstrapcdn.com
//use.fontawesome.com
//player.vimeo.com
//github.githubassets.com
//referrer.disqus.com
//c.disquscdn.com
//0.gravatar.com
//2.gravatar.com
//1.gravatar.com
//ad.doubleclick.net
//googleads.g.doubleclick.net
//stats.g.doubleclick.net
//cm.g.doubleclick.net
//stats.buysellads.com
//s3.buysellads.com

Awesome!

How to optimise other ad networks like Media.net, Taboola etc.. .

Thanks for this list but can anyone please explain by adding all these URLs in WP-Rocket URLs to prefetch. How can it help our website? Is it safe? Or How it will help I tried it on my website and still page speed loading is very low. Please guide me if possible Thanks

Thank you.. My website called custom logo still running slow. Please help.

https://docs.wp-rocket.me/article/1302-prefetch-dns-requests
https://wp-rocket.me/blog/how-to-reduce-dns-lookups-to-speed-up-your-wordpress-site/
https://developer.mozilla.org/en-US/docs/Web/Performance/dns-prefetch

for jetpack cdn is not complete, there is s0, s1, s2

Updated to include those if a someone is using the Image CDN/Asset CDN in Jetpack.

Hi there, Should I copy-paste the list on the website even if I do not use those websites at all. For example, in the list, I do not use this service at all //s3.buysellads.com

So should I still add this URL in the list or do I have to cherry-pick from the list?

Or if I can copy-paste all the list it will not affect the performance? I am using the whole list on my own website https://www.khalsa-website-designers.net/ but I do not know if enabling or disabling effect on the performance and if I should copy-paste the full list given above or should I only copy-paste the services I use.

You only need to DNS prefetch the external URL requests being made on your site. I would check the site using
https://www.webpagetest.org/

Then look for all of the external URL requests.

Thanks :)

Hi brother Lukecav, Thank you very much. I have checked that website page test .org website and I found the list of domains I should add. Here is the screenshot = http://prnt.sc/sov9vv

But I have another question now. The question is that do I have to add these lines before the domain //
Or should I not add those lines before the domain?

In other words: Should I add domains like this:
http://prnt.sc/sovazp
or like this
http://prnt.sc/sovbu1

You will need to add // before the domain name.

Hello brother Lukecav. You have helped me to get this issue nearly solved and those who had questions like me they will get the help for the lifetime from this post and comments.

Brother one last question. What about those domains which have www. before the domains?

Example:
www.google.com
www.googletagmanager.com
www.google-analytics.com

Should we be adding these domains like this:
//www.google.com
//www.googletagmanager.com
//www.google-analytics.com

or like this:
//google.com
//googletagmanager.com
//google-analytics.com

Thank you in advance.

With www is fine on those sites.

hi sir , i use all of thoe list on my website , is that ok or it will slowing down my site ? or should i only use several important ?

Only use the external site URLs that are being requested on your site and no it will not slow your site down, the idea is that the DNS requests that are external will be prefetched for the site user.
https://www.chromium.org/developers/design-documents/dns-prefetching

Brother Lukecav, Your replies are helping people like me who did not know anything about DNS Prefetching. Brother, I want to as you a question and this question may be hitting others mind too.

Let's say I have added nearly 8 domains in the Prefetching. When a user visits the website for the first time. Will all of those 8 domains affect the logging time for the first time user? I mean if someone is visiting for the first time from his device then do you think it will take nearly 1-3 seconds time to Prefetch the DNS for those domains as well and that will make the site slower for the new user?

Or does it work like this --> The user came for the first time. Once the full website is loaded then the browser sends the command to prefetch DNS for all the links on the page.

Another question related to this question:- I always add my website link in the footer of all the websites I create. For example, you can see here https://bestandcheapbondcleaning.com.au/ so on this best and cheap bond cleaning website should I add my domain in the prefetch DNS section too?

lukecav - I hope that you or someone else in this forum may be able to clarify this for me. I added //soundcloud.com to my dns prefetch list. I am still having issues (see attached file) Should all these be added too: //wave.sndcdn.com, //w.soundcloud.com

I also came across code.ionicframework.com when running a test - should this be added to my prefetch list as well?

Any feedback would be greatly appreciated!