Just to add to this thread, my Mac Air has the same issues when using Safari to access FT. It's fine when using Chrome though. Seems to be some sort of compatibility issue? Safari now comes up with a warning that this webpage is using significant memory. Can't type responses to anything without sitting and watching the computer type the words about ten secs after I have actually hit the keys!!

And no, I have no issues on Safari with any other site. In fact, I can flick over to another open tab on another website and it runs fine.