I recently started running an ad blocker again, after a number of years without one. Why? Because an advert was using so much CPU that it was interfering with m

I recently started running an ad blocker again, after a number of years without one. Why? Because an advert was using so much CPU that it was interfering with my browsing in other tabs and running down my laptop battery. This is a problem across web design. Web developers seem to have forgotten (or have slowly been forgetting for years) that huge amounts of javascript has a noticeable impact on the users computer. If I don't intentionally stop javascript executing on some pages the resulting CPU usage will drain my battery in half the normal time.