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Even on Windows it's a nuisance. Flash adverts are often so poorly implemented that merely visiting a website will push a laptop's fan to full power.

I am not against Flash though, I just wish they would put more effort into making it efficient and reliable on all platforms.

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I'm surprised that there isn't more talk about Flash efficiency and its impact on global energy consumption and the environment. My desktop CPU burns an extra 50 watts when it is pegged at 100% (and in a typical day, Flash is the only thing that pegs my CPU for a prolonged period of time). Multiply that by hundreds of millions of computers running Flash -- many whose owners don't realize their CPUs are at 100% -- and it adds up to potentially millions of extra pounds of CO2 emissions every day.

Chrome, block all plug-ins by default. You'll never see a flash ad again, but instead a big gray box in it's place. Should you need to activate flash to watch a video on a web page then you can just click the gray box and it will load the plug-in. Works great for me.

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