Just updated to Safari 8.0.6 yesterday and am now facing spinning balls every 5 to 10 seconds. I've killed Flash so I don't think that's it. When it occurs, Safari moves to >100% cpu in Activity Monitor. I've quit, rebooted but those do not fix it. Mac Pro 2010 with 12-cores and 128 GB of RAM. Doesn't seem to do this with my 2014 MBA. Any ideas?