The following are just seat-of-the-pants observations right now...
I've been using PT for a while and I've noticed that when an app is tamed/untamed while it's downloading a large file, the download speed appears to fluctuate up and down quite a bit. I use Net Meter and I can see the download speed and consistency. A solid red band indicates a smooth download, while spiky lines shows d/l speeds going up and down. It's this latter that I usually see when P/T kicks in.
I know it's only circumstantial evidence so far. I have since disabled P/T and I haven't noticed any "spiky" downloads yet.
Has anyone else observed similar behaviour?
Mouser, can the process of jacking up/down an app's priority cause connection speeds to vary?