The problem is they don't know what the problem is, so there is your problem!
If the owner of a website can't find the issue there is something seriously wrong there in itself.
I won't be paying another £10 for a shit slow website. I reckon the owner of IB should sell his Yacht and invest some fucking money.
Edit: What they should do is take it back to a barebones forum, this in my opinion will help establish what exactly is causing the problem, maybe there just isn't quite enough MSD advertisements