OSX 10.6.3 all updates applied. connected to airport 3ghz core 2 duo, 4gb ram the problem I have is that kernel_task takes 15 to 20% (system) CPU all the time, when Airport is "on" (but no network traffic) and 0% when airport is switched off. I find this unreasonable. It also makes the Mac soggy when the browser is also choked up, as 25% is basically 100% of one core on a 4 core machine. Any ideas?