Why does my Macbook overheat and use so much CPU and energy when on YouTube?

For a long time now, my Macbook has been overheating and hogging my CPU. According to Activity Monitor, Google Chrome Helper is the culprit. Whenever I am browsing the web, there are usually ten seperate entries of Google Chrome Helper in Activity Monitor, each individually using around %0.5 of my CPU. On YouTube, one of these can spike up to using %82, with a second using %22. I don't understand the math behind it but its evident in the screenshots I took. I own an up-to-date MacBook Pro (13-inch, Mid 2012) so it could be a result of an old system but only Chrome and YouTube (or just videos) are causing this issue. Here are some things I’ve attempted to control / solve this: * updating FlashPlayer * disabling extentions * turning off Unsandboxed plug-in access to "not allow any site to use a plug-in to access [my] computer" * turning off JavaScript (which, of course, just stopped the page from loading in - very power efficient and cool, but not the trade off I had hoped to accomplish) I've tried other web browsing apps and they net similar results as Chrome. I believe it has something to do with videos in general that are being served At the moment, I have had to use an app called MacsFanControl so my fan stops the CPU and computer from overheating as it used to get to around 50˚C. Now, it is sits at 40˚C with the fan running on high to prevent it increasing. Am I missing controls or options to have less heat from the CPU of this era MacBook Pro?