drop in performance when running on battery
Mac book pro 13 mid 2011work normal on connect to AC Power. At the same time unplugged AC Power performance degradation occurs, the computer is running very slowly. The system monitor displays the kernel-task 150%, the fan spins 6000, but the temperature is 30-40 degrees. After plug AC Power everything comes back to normal in 10-15 seconds.
battery operated has become impossible. Where to look, in what could be the problem?
MacBook Pro, OS X Yosemite (10.10.5)