Description of the issue: My Brave is using too much CPU, more than 50%
Steps to Reproduce (add as many as necessary): 1. 2. 3. 3
Actual Result (gifs and screenshots are welcome!): 
Expected result:
Reproduces how often: All the time
Operating System and Brave Version(See the About Brave page in the main menu): Windows 10 / 0.64.77 Chromium: 74.0.3729.169
Additional Information: This is affecting me a lot because I can not do anything