For about 10 days, my CPU usage is 100% sometimes, the problem occurs basically whilst browsing with Chrome. On 2019.06.18, I installed Android Studio and was following an online tutorial. Some minutes later my computer became very slow, so I closed the software. This is also the case with BlueStacks. But unlike BlueStacks, the CPU usage didn't go back to normal (7-40%) after I closed Android Studio and all other programs. So I became afraid, thought my computer has virus, and so uninstalled...
CPU usage is 100%
CPU usage is 100%