Safari uses sky-high CPU after upgrade to Sierra on Macbook Pro
MacBook Pro with Retina display, MacOS Sierra
MacBook Pro with Retina display, MacOS Sierra
After digging deeper, I found a solution. It was Trusteer Rapport that I'd installed for safer online banking. This is the thread that helped meSafari 10 High CPU Usage
Excellent - thank you! I have uninstalled Trusteer Endpoint Protection and sent them a support message.
Safari uses sky-high CPU after upgrade to Sierra on Macbook Pro