Is it necessary to install toolbar to have stumble? I want to do it without using toolbar. Please advise
So just create an account on stumble and use it. Toolbar is good for stumbling good pages that you liked.
You do not need to install a toolbar to stumble a story. You could simply create a stumbleupon account and stumble a story from the website as well.
Turning wireless off & reducing brightness will help, and disabling bluetooth will give you a large boost as well. I don't think turning off one CPU will help that much, but you should consider enabling throttling (cpuspeed) to reduce your CPUs core speed when they aren't in full use. There's also a few other tricks you can do like disabling HAL polling and increasing the writeback time - install "powertop" and run it as root for more information on how to do this. Another thing that may be interesting is if you don't need to access the disk very often, load what you need into RAM using ramfs and then park the hard disk.