Ad scripts slow your browser

[DelJo63]

But you intuitively knew that - - now it's quantified.
BBC.Com has an article that declares just how much.

• About 60% of the total loading time of a page was caused by scripts that place adverts or analyse what users do
• Javascript code helping Google place ads on pages and analyse user activity bestowed the longest delays
• its analytics system were found on the largest number of sites in the million sampled
• these can add more than two-thirds of a second to loading times
• WordAds script for WordPress blogs that, all by itself, can delay the arrival of an entire page by up to 2.5 seconds.

Sadly, Ad-blockers can end up "triggering convoluted workaround logic and complex disguising of ads that increase script execution time", he told The Register.

see the article for the details.

 

[learninmypc]

Got a link ?? Or, is this it https://www.bbc.com/news/technology-47252725

 

[DelJo63]

Yes that's it -- notice that BBC.com IS the same link

 

[learninmypc]

Too weird , when I first read it, there was no link, thus my post. Now it is, weird

 

[DelJo63]

And as strange as it may sound, far too many webmasters place JavaScript in the html head or at the top of the body tag, which slows loading of other content. Goes to show you that they don't understand that NO JavaScript can be triggered until the other content is loaded and armed via the OnLoad() method.