Today, more than 90% of Flash on the web loads behind the scenes to support things like page analytics. This kind of Flash slows you down, and starting this September, Chrome 53 will begin to block it. HTML5 is much lighter and faster, and publishers are switching over to speed up page loading and save you more battery life. You'll see an improvement in responsiveness and efficiency for many sites.
Safari wins most of the benchmarks – often by a substantial margin – but you’ll find it doesn’t make much of a difference in terms of everyday use.
and battery life well.. Chrome loses there too.
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You might have seen some stories talking about how Chrome is a notorious energy hog – because frankly it is. You don’t even need to do a series of battery tests to understand the difference the two browsers have on your Mac’s battery life.
Apple includes a handy tool within OS X for illustrating the degree to which the applications you use decrease your battery life. To see it for yourself, all you need to do is click on the battery icon in the menu bar at the top of your screen.
Here for it I have to close the little Shockwave Flash plugin on the Task Manager several times throughout the day otherwise it'll make the whole browser slow down.