new bought Macbook Pro becomes slow every time after two hours running
new bought Macbook Pro becomes slow every time after two hours running, not installing any software except MS Office; half CPU and MEM is not used : OSX 10.11; 2.9 GHz Intel Core i5; 8G mem
MacBook Pro (Retina, 13-inch,Early 2015), OS X El Capitan (10.11)