com.apple.webkit.webcontent highly load CPU

Sometime i have noticed that CPU and GPU temperate very hight, it loads from 45-47 till 58-59 and in same time i'm only using Safari and no any other soft with hard processes. When i'm open CPU usage real time, i see that com.apple.webkit.webcontent loading CPU sometime in 300% by that temperate begin to be very hight. When i kill this process all begin to work normal and not slowly. Its happen sometime. But i want to solve this problem. Any one had got this problem and found solution for this? As i understand its something with Safari right?