I had a similar problem a few years back, running an old Windows XP-based PC operating with (don't laugh) 250 mb of memory. After I upgraded the memory to 500 mb, and blew six years worth of dust from the insides of the case, the problems with the fan went away. The CPU usage still spiked up to about 70% when watching some youtube videos, but normally ranged around 25-40%.
In order to get help, you'll probably have to put down some specs, including:
The brand of laptop you're using/how old it is.
The operating system--windows xp/windows seven/whatever.
The amount of RAM you have installed. (In that way, the techs can see if it meet's the basic system requirements for the newer versions of Flash Player.)
What browser you're using--Firefox/IE/etc.
The complete version number of flash player you're using.
(not a techie)
I'm starting to feel the same way. Rolled all the way back to 10.3 and still getting jerky/lagging visual that i never had before the latest updates.. I think Adobe has officially killed flash technology. I don't even remember the days when i could watch a video in peace without frame rate/crashing issues...