feat(gatsby-plugin-google-analytics]: DNS prefetch google analytics domain in head

[maciekmaciej]

Summary

I saw that gatsby website is doing this:
https://github.com/gatsbyjs/gatsby/blob/master/www/gatsby-ssr.js#L10
And I'm wondering if it's a good idea to do it by default in gatsby-plugin-google-analytics.

Motivation

Maybe things will go a little faster with that approach.

[pieh]

@m-allanson do you remember if there was reason we added this just for gatsbyjs.org and not to google analytics plugin directly?

[m-allanson]

I have no idea why I did it like that 😅

It seems like a good idea to add it to the google analytics plugin though. It's something that gets highlighted during a Lighthouse audit. Looking at the audit for gatsbyjs.org:

Does google analytics (GA) always connect to google.com too? That could be worth investigating, and adding if it's a domain that GA always connects to.

[maciekmaciej]

I found all these in source:

• //www.google-analytics.com
• //www.google.com
• //stats.g.doubleclick.net
• //ampcid.google.com

but only //www.google-analytics.com and //www.google.com appears to be used often when I look on requests while browsing some sites.

I can make a PR for that and add these two domains. I would use relative protocol // since analytics.js would use http:// if site is served with that.

It's also worth looking into this aspect in gatsby-plugin-google-tagmanager plugin.

[gatsbot]

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[heyayush]

Keep open

[dougwithseismic]

Anyone working on this? I'll pick it up if not.

[wardpeet]

@dougwithseismic Thank you for wanting to contribute, sadly we already have support for it and it was added in #12826.

I'll be closing this one for that reason.