I get this on my laptop. If I've been on a eurogamer page for a minute or so I can hear the fan start to speed up and it gets noticeably hotter. Things will always go back to normal once I close any eg windows/tabs.
Yep. I browse the web in tranquil silence until I read EG and the fan starts grinding away. On the ancient mac I use at work I had to disable flash to be able to read EG.