Is there an update to this issue?
Every time I get on FlyerTalk, within five minutes I get the dreaded pinwheel spinning constantly which locks me out. No other site gives me this problem. To get back to FlyerTalk, I have to close the browser and start over. Not every time but regularly I also receive the warning "This webpage is using significant memory". This is also only on FlyerTalk.
I am using a MacBook Pro running macOS Mojave 10.14.1 and Safari 12.0.1