Over the past two months or so, my MBP has significantly slowed down in speed and normal operating temperature has risen around 15 degrees C. I'm not doing anything differently application wise. iTunes, Twitter, Mail, Safari, occasionally Word or something. WindowsServer and kernel_task seem to be the highest resource hungry services running in Activity Monitor. I've taken the back case off and blown out what little dust there was. I haven't replaced any hardware. I have a warranty through Bestbuy's Geek Squad, but I'm seeing if there's any "natural remedies" before I do that. The only thing I can guess is that my battery is causing damage since it's "Replace Soon" condition. Any ideas?