At the same time you are attempting to load a problem site, run a speed test and see what's happening.
Also, try pinging the problem site to see if you get a ping response. If you do, it implies it is the browser that is at fault.
Or maybe the sites you're having issues with have a paywall or similar, and Chrome is able to get through it with an extension.
Edit: Re the temperature sensor, I think most only upload once every minute.