[Mark McLeod]

You should add a timer to each of your two parallel While loops to prevent one or the other from hogging the CPU. One loop could be starving the other loop. Add a 50ms Wait to the outer part of each While loop and that will periodically release the CPU to process other tasks.

Other than the obvious "Fire? = false" case causing a half second delay in that parallel loop, I don't see anything unusually slow in your code. Because it's parallel it shouldn't slow down the first loop.

The nested Cases aren't a problem unless something time consuming happens in one of the hidden ones. Can't see where the first Tick Count goes off to, but I don't imagine you're doing anything unusual with that either.