Working in e-commerce, there is a truly monstrous amount of javascript tracking snippets that enterprise level sites use. 30+ individual snippets and tracking pixels being pulled into the page. Polluting the console with JS errors and console logs.

Thanks to Google Tag Manager, we don't even get a say anymore. It's out of our hands. We can put hours into optimising animations and UX but it is in vain once the marketing companies get their hands on the GTM account. With enterprise level clients near quarterly change of marketing provider, I'm sure many of the snippets aren't even being used anymore, they sit there because the new account manager is too afraid to remove them and no one truly understands what gets delivered to the customer's browser.

We will spend immense time architecting performant backend solutions and infrastructure, then we decide that tens of thousands of completely disjointed lines of javascript, that we've never seen unminified and have no idea who wrote it, is probably fine to deliver straight to the browser. Don't worry, caching will solve the network problem, and everyone has quad-core smartphones now so it's probably okay.

Weird, the screen keeps flickering and scrolling isn't smooth. Oh well, probably a browser bug.