I have now removed a heap of old threads - any that hadn't been posted in for over 6 months.
There was 3 years worth of topics so it was starting to build up.
If people are really eager to check something in the older posts then you're in luck - I have started an
archive forum which has all the old threads, but it is read-only.
From time to time (maybe every 6 months or so) I'll move untouched threads over there.