[mrtksn]

I gave it a try. So I searched for "Trump" in Safari mobile, the result page loaded 2.5mb. It loaded a bit more when I clicked on an AMP article and kept loading more as I jump from article to article. It did not load any data without me switching to the next article.

After 10 articles, the transferred data was 28MB. I visited the Guardian's own website and it fetched 3MB.

So, It looks like Google does not preload a huge amount of data.

ps: I use ad-blocking and cleaned the cache.

[arthurcolle]

How are you able to look at how much data was transferred on Safari mobile? As far as I know you can't access dev tools on mobile. Did you just change the User Agent on your computer to simulate?

[mrtksn]

You can! You can use the desktop Safari to connect to your iPhone's Safari and access full developer tools.

Just connect your iPhone to a Mac, open Safari desktop and in the Develop menu, you will see your mobile phone. When you open a page on mobile Safari, you will be able to see it from the Develop menu and when you click on it, the full Safari developer tools will open in a new window. Works just like the regular developer tools.

[wizzwizz4]

I do know it preloads on Chrome on Android on mobile networks, but it's a little surprising that it doesn't on Safari on iOS.