flash is a technology that is so proprietary and closed, hence make your laptop drains its battery really fast. just read this article for proof.
I strongly suggest you disabled flash, install noscript in your firefox browser. or if you use chrome disable flash by going into tools–>Under The Hood–>Content Settings
flash uses too many cycles in CPU, and also it’s an old technology. even steve jobs hated flash. so take my advice then, leaves flash or just block it in your browser and that will make your system more responsive.