I installed the latest update with Pixel today on my RPi3 and after a short period of happy browsing on Chromium, I was greeted by the thermometer icon on the right side of my screen. Running
, I saw I was above 80 C. I tried using less gpu memory but that was no help. Only killing the browser would bring the temp down. I already have copper heat sinks installed on the two upper chips so a fan is the next step for cooling but the noise increase is unacceptable. With htop, I see my pi using 100% of all four cpu cores.
Any suggestions for minimizing the load?
It's not "Pixel", which is just a new LXDE desktop design.
All Browsers are resource hogs, at least once you start using them and open lots of web pages.
On the RPi you should NEVER open more than a few web pages at the same time. It will soon start swapping, because the browser will need more memory,
You should restart the browser from time to time because it is caching a lot and will therefore use lots of memory.
Both Firefox and Chromium are multi-threaded and use multiple cores. Some web pages are simply programs written in JS which are running all the time. This will take a lot of your processing power although nothing really seems to happen and especially when you are connected to multiple websites of this kind.
A heat sink won't help much without a good airflow. With most RPi cases the airflow is terribly bad or there is none at all. For my RPi3 I use a case with open sides and it almost never starts to throttle, even when all 4 cores are running at 100% (I'm not using a fan and don't want to).
Or get the FLIRC case.