Worst performance has to be either
Kim Heiselberg vs Walsall or Marko Tuomela vs Tranmere.
Both were Colin Todd recruits and both were substituted at half time...In fact I seem to remember Heiselberg taking about 6 throw ins and each one being a foul throw.
I remember that match, and also remember the foul throw ins. How he played for Finland i'll never know, definately the worst performance from a Swindon player i've seen....