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So, some months ago, I was about to do a clean install of Yosemite and was trying to avoid installing Flash. I tested how much CPU Flash uses on my Mac, Safari used the least CPU power (fastest), Google Chrome (using it's Flash emulator or whatever) used a lot more CPU (I think it was like 20-30% more). I don't have Chrome, I hate google, so deleted it when I found Safari to be better, (also hate Flash, but, only way to watch some video still), but, anyone know, has Google made improvements to Chrome's speed/CPU usage recently? Maybe I should try it again?
I have done another test, Safari, Firefox, Chrome, all while playing the exact same flash video (via Hulu). Safari wins, as it still uses less CPU load than the rest. Firefox is a close second, but, since Chrome uses emulation or offline flash processing, it uses much more CPU load than the others still, so Chrome goes back in the Trash can. (I wish all the web would put Flash in the trash.). If Hulu would change free accounts to HTML5 or enable free accounts on ATV or iOS I might be able to dump flash. (Hulu+ customers get ATV & iOS, but, also still get commercials & ads, so I won't pay.)
The odd thing is, my CPU temp was hovering around 90º-92ºC before testing (it must shut down around 95ºC), and the really odd thing is that all of these were running the CPU around 85º-90ºC w/fan at full speed. I would think more CPU load would mean hotter CPU, so, that's confusing. But, I do have to say, Firefox and Chrome has more "jiggles" with the video than Safari.
So, Safari is still first pick for browsing and video.
(screenshots were taken while watching the same exact episode on hulu at full screen on second monitor, while doing nothing else.)