There is a process RTBroker in windows10 that chews on your CPU resources. When you see this happening open the Task Manager and stop that process from running. It's a process that sends information to Microsoft about what you are doing on your computer. Windows 10 is a joke it was all set up with Security Features that can't be disabled just so Microsoft can spy your every move you do on your computer. As long as that one process doesn't run Microsoft gets no information but when the process runs it uses close to 90% of the CPU Resources which will cause a machine to what's known as crawling.