Well recently the tool has started lagging for me now as well. I really have no idea what's causing it.
Vs my friend in Cali:
If we use the tool, we get delay 4 with ping at around 100 and then spikes of high 100s- high 200s. If we don't use the tool, there are no spikes with delay 5; ping of ~80-90. If my friend uses the tool and I don't, we get slight spikes up to low 100s with delay 5. If I use it and he doesn't, we get the big spikes and high ping with delay 4.
EDIT: I was hosting all three times (direct host). I just tried against someone else and there's no lag spikes at all. This just seems really weird because when I played with my friend around a month ago, we had no problems with the tool and it ran fine. It was only recently it started giving us lag spikes.