In OS X you may find the process "kernel_task" taking up a large amount of RAM. Here is why this is happening and what you can do about it.
There have been many reports, especially with MacBook Air and other laptop owners, where the Mac OS X "kernel_task" process takes up a large amount of CPU when checked in Activity Monitor. When this happens, the computer may run slower and also may app
MacFixIt reader "Martin V." writes in to alert us about an ongoing issue with his MacBook Air. The process 'kernel_task' uses an inordinate amount of system resources causing his system to run abnormally hot.