As per the subject. There is 'Go to first unread post' option on some threads (right at the top of the thread, right hand side), but not on all of them. It is very useful for hot threads that get a lot of responses and for the ones with many pages.
Why is it not available for all the threads with new posts?
For example, I am unable to see it in this thread: http://forum.step-pr...ing-takes-time/
But it is visible in this one: http://forum.step-pr...-by-prometheus/