That’s actually very interesting, and I suspect something was wrong on there side.
Max PHP execution time is typically 30 seconds by default. There is no way it takes that long.
Unless maybe they set it to some ridiculously low number like 1 second.
The RSS for topics loads in just under one second for me however.
I do see that you allow a HUGE number of topics per forum page.
I suspect that is for google, yes?